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    3004.90.92

    Other

    This code segment details the tariff classification for pharmaceutical products, covering items like immunologic materials, surgical supplies, and various medicaments based on their composition and use. It’s essential for determining the correct duty treatment and proper placement of these goods within the Harmonized Tariff Schedule, guiding importers and customs officials alike.

    Other

    Detailed information for HTS Code 3004.90.92

    This excerpt details pharmaceutical products under chapter 30 of the Harmonized Tariff Schedule. It specifically covers a wide range of medicaments, from those affecting the eyes and respiratory system to preparations impacting the electrolytic balance, all classified within various subcategories of section IV. The notes define what constitutes a “medicament” for tariff purposes, exclude certain items like dietary supplements and nicotine patches, and clarify how mixtures and unmixed products are treated for classification. Statistical suffixes are used to further specify the type of medicament, and choosing the correct one depends on the active ingredients and form of the product as detailed in the notes and subcategories.

    ChapterChapter 30 - Pharmaceutical products
    SectionSection VI - Products of the Chemical or Allied Industries

    Duty snapshot

    Quick reference for the duty outcomes tied to this HTS line.

    General Duty

    Free

    Standard trade partners (NTR)

    Special Duty

    N/A

    Eligible FTA or preference programs

    The general duty rate for Chapter 30, Pharmaceutical Products, is currently not specified. However, the Harmonized Tariff Schedule allows for potential special rates based on Free Trade Agreements (FTAs), which would require documentation proving the goods’ origin to qualify. These rates, if applicable, could be reduced or eliminated compared to the general rate. The main code (3004) and its subdivisions are typically classified based on the net weight or quantity of the product, requiring units such as kilograms or liters for duty assessment. Specific rates for individual subdivisions within 3004 are not specified in the provided text.

    Rate of Duty (Column 2): 30%

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    Code subdivisions

    3004.90.92.01

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > For veterinary use

    Parent subheading for dairy herd replacements
    3004.90.92.02

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Anti-infective medicaments: > Antivirals

    Parent subheading for dairy herd replacements
    3004.90.92.04

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Anti-infective medicaments: > Antifungals: > Containing fluconazole or its salts

    3004.90.92.06

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Anti-infective medicaments: > Antifungals: > Other

    3004.90.92.08

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Anti-infective medicaments: > Antiprotozoals (excluding goods described in subheading note 2 to this chapter): > Containing metronidazole or its salts

    3004.90.92.12

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Anti-infective medicaments: > Antiprotozoals (excluding goods described in subheading note 2 to this chapter): > Other

    3004.90.92.13

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Anti-infective medicaments: > Sulfonamides

    3004.90.92.14

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Anti-infective medicaments: > Other

    3004.90.92.15

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Antineoplastic and immunosuppressive medicaments

    Parent subheading for dairy herd replacements
    3004.90.92.16

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Cardiovascular medicaments: > Containing metoprolol or its salts

    3004.90.92.17

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Cardiovascular medicaments: > Containing amiodarone or its salts

    3004.90.92.18

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Cardiovascular medicaments: > Containing diltiazem or its salts

    3004.90.92.19

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Cardiovascular medicaments: > Containing hydralazine or its salts

    3004.90.92.21

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Cardiovascular medicaments: > Other

    Parent subheading for dairy herd replacements
    3004.90.92.22

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Analgesics, antipyretics and nonhormonal anti-inflammatory agents: > Tolmetin

    3004.90.92.23

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Analgesics, antipyretics and nonhormonal anti-inflammatory agents: > Tolmetin sodium dihyrate

    3004.90.92.25

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Analgesics, antipyretics and nonhormonal anti-inflammatory agents: > Tolmetin sodium (anhydrous)

    Parent subheading for dairy herd replacements
    3004.90.92.27

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Analgesics, antipyretics and nonhormonal anti-inflammatory agents: > Containing ibuprofen or its salts: > For oral suspension

    3004.90.92.29

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Analgesics, antipyretics and nonhormonal anti-inflammatory agents: > Containing ibuprofen or its salts: > Other

    3004.90.92.31

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Analgesics, antipyretics and nonhormonal anti-inflammatory agents: > Containing acetaminophen or its salts: > For oral suspension

    3004.90.92.32

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Analgesics, antipyretics and nonhormonal anti-inflammatory agents: > Containing acetaminophen or its salts: > Other

    3004.90.92.33

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Analgesics, antipyretics and nonhormonal anti-inflammatory agents: > Containing O-Acetylsalicylic acid (Aspirin)

    3004.90.92.34

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Analgesics, antipyretics and nonhormonal anti-inflammatory agents: > Other

    3004.90.92.36

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Anticonvulsants, hypnotics and sedatives

    Parent subheading for dairy herd replacements
    3004.90.92.37

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Antidepressants, tranquilizers, and other psychotherapeutic agents: > Containing lorazepam or its salts

    3004.90.92.38

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Antidepressants, tranquilizers, and other psychotherapeutic agents: > Containing olanzapine or its salts

    3004.90.92.39

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Antidepressants, tranquilizers, and other psychotherapeutic agents: > Other

    3004.90.92.40

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the central nervous system: > Other

    3004.90.92.42

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Dermatological agents and local anesthetics: > Containing lidocaine or its salts

    3004.90.92.44

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Dermatological agents and local anesthetics: > Other

    3004.90.92.50

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the digestive system: > Laxatives

    3004.90.92.55

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the digestive system: > Antacids

    3004.90.92.56

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the digestive system: > Containing famotidine or its salts

    3004.90.92.57

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the digestive system: > Containing pantoprazole or its salts

    3004.90.92.59

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the digestive system: > Other

    Parent subheading for dairy herd replacements
    3004.90.92.63

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Preparations pimarily affecting the electrolytic, caloric or water balance: > Diuretics: > Containing furosemide and its salts

    3004.90.92.66

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Preparations pimarily affecting the electrolytic, caloric or water balance: > Diuretics: > Containing hydrochlorothiazide or its salts

    3004.90.92.68

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Preparations pimarily affecting the electrolytic, caloric or water balance: > Diuretics: > Other

    3004.90.92.70

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Preparations pimarily affecting the electrolytic, caloric or water balance: > Other

    3004.90.92.76

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the eyes, ears, or respiratory system: > Cough and cold preparations

    Parent subheading for dairy herd replacements
    3004.90.92.80

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the eyes, ears, or respiratory system: > Other: > Antihistamines

    3004.90.92.84

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the eyes, ears, or respiratory system: > Other: > Containing albuterol sulfate

    3004.90.92.89

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Medicaments primarily affecting the eyes, ears, or respiratory system: > Other: > Other

    3004.90.92.91

    Medicaments (excluding goods of heading 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic uses, put up in measured doses (including those in the form of transdermal administration systems) or in forms or packings for retail sale: > Other: > Other > Other: > Other

    View HTS reference

    Chapter & section notes

    Chapter notes

    Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes CHAPTER 30 PHARMACEUTICAL PRODUCTS VI 30-1 Notes 1. This chapter does not cover: (a) Foods or beverages (such as dietetic, diabetic or fortified foods, food supplements, tonic beverages and mineral waters), other than nutritional preparations for intravenous administration (section IV); (b) Products, such as tablets, chewing gum or patches (transdermal systems), containing nicotine and intended to assist tobacco use cessation (heading 2404); (c) Plasters specially calcined or finely ground for use in dentistry (heading 2520); (d) Aqueous distillates or aqueous solutions of essential oils, suitable for medicinal uses (heading 3301); (e) Preparations of headings 3303 to 3307, even if they have therapeutic or prophylactic properties; (f) Soap or other products of heading 3401 containing added medicaments; (g) Preparations with a basis of plaster for use in dentistry (heading 3407); (h) Blood albumin not prepared for therapeutic or prophylactic uses (heading 3502); or (ij) Diagnostic reagents of heading 3822. 2. For the purposes of heading 3002, the expression "immunological products" applies to peptides and proteins (other than goods of heading 2937) which are directly involved in the regulation of immunological processes, such as monoclonal antibodies (MAB), antibody fragments, antibody conjugates and antibody fragment conjugates, interleukins, interferons (IFN), chemokines and certain tumor necrosis factors (TNF), growth factors (GF), hematopoietins and colony stimulating factors (CSF). 3. For the purposes of headings 3003 and 3004 and of note 4(d) to this chapter the following are to be treated-- (a) As unmixed products: (1) Unmixed products dissolved in water; (2) All goods of chapter 28 or 29; and (3) Simple vegetable extracts of heading 1302, merely standardized or dissolved in any solvent; (b) As products which have been mixed: (1) Colloidal solutions and suspensions (other than colloidal sulfur); (2) Vegetable extracts obtained by the treatment of mixtures of vegetable materials; and (3) Salts and concentrates obtained by evaporating natural mineral waters. 4. Heading 3006 applies only to the following, which are to be classified in that heading and in no other heading of the tariff schedule: (a) Sterile surgical catgut, similar sterile suture materials (including sterile absorbable surgical or dental yarns) and sterile tissue adhesives for surgical wound closure; (b) Sterile laminaria and sterile laminaria tents; (c) Sterile absorbable surgical or dental hemostatics, sterile surgical or dental adhesion barriers, whether or not absorbable; (d) Opacifying preparations for X-ray examinations and diagnostic reagents designed to be administered to the patient, being unmixed products put up in measured doses or products consisting of two or more ingredients which have been mixed together for such uses; Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes VI 30-2 Notes (con.) (e) Placebos and blinded (or double-blinded) clinical trial kits for use in recognized clinical trials, put up in measured doses, even if they might contain active medicaments. (f) Dental cements and other dental fillings; bone reconstruction cements; (g) First-aid boxes and kits; (h) Chemical contraceptive preparations based on hormones, on other products of heading 2937 or on spermicides; (ij) Gel preparations designed to be used in human or veterinary medicine as a lubricant for parts of the body for surgical operations or physical examinations or as a coupling agent between the body and medical instruments; (k) Waste pharmaceuticals, that is, pharmaceutical products which are unfit for their original intended purpose, for example, because of expiry of shelf life; and (l) Appliances identifiable for ostomy use, that is, colostomy, ileostomy and urostomy pouches cut to shape and their adhesive wafers or faceplates. Subheading Notes 1. For the purposes of subheadings 3002.13 and 3002.14, the following are to be treated: (a) As unmixed products, pure products, whether or not containing impurities; (b) As products which have been mixed: (1) The products mentioned in (a) above dissolved in water or in other solvents; (2) The products mentioned in (a) and (b)(1) above with an added stabilizer necessary for their preservation or transport; and (3) The products mentioned in (a), (b)(1) and (b)(2) above with any other additive. 2. Subheadings 3003.60 and 3004.60 cover medicaments containing artemisinin (INN) for oral ingestion combined with other pharmaceutical active ingredients, or containing any of the following active principles, whether or not combined with other pharmaceutical active ingredients: amodiaquine (INN); artelinic acid or its salts; artenimol (INN); artemotil (INN); artemether (INN); artesunate (INN); chloroquine (INN); dihydroartemisinin (INN); lumafantrine (INN); mefloquine (INN); piperaquine (INN); pyrimethamine (INN) or sulfadoxine (INN). Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes VI 30-3

    Section notes

    SECTION VI PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES VI-1 Notes 1. (a) Goods (other than radioactive ores) answering to a description in heading 2844 or 2845 are to be classified in those headings and in no other heading of the tariff schedule. (b) Subject to paragraph (a) above, goods answering to a description in heading 2843, 2846 or 2852 are to be classified in those headings and in no other heading of this section. 2. Subject to note 1 above, goods classifiable in heading 3004, 3005, 3006, 3212, 3303, 3304, 3305, 3306, 3307, 3506, 3707 or 3808 by reason of being put up in measured doses or for retail sale are to be classified in those headings and in no other heading of the tariff schedule. 3. Goods put up in sets consisting of two or more separate constituents, some or all of which fall in this section and are intended to be mixed together to obtain a product of section VI or VII, are to be classified in the heading appropriate to that product, provided that the constituents are: (a) Having regard to the manner in which they are put up, clearly identifiable as being intended to be used together without first being repacked; (b) Entered together; and (c) Identifiable, whether by their nature or by the relative proportions in which they are present, as being complementary one to another. 4. Where a product answers to a description in one or more of the headings in section VI by virtue of being described by name or function and also to heading 3827, then it is classifiable in a heading that references the product by name or function and not under heading 3827. Additional U.S. Notes 1. In determining the amount of duty applicable to a solution of a single compound in water subject to duty in this section at a specific rate, an allowance in weight or volume, as the case may be, shall be made for the water in excess of any water of crystallization which may be present in the undissolved compound. 2. For the purposes of the tariff schedule: (a) The term "aromatic" as applied to any chemical compound refers to such compound containing one or more fused or unfused benzene rings; (b) The term "modified aromatic" describes a molecular structure having at least one six-membered heterocyclic ring which contains at least four carbon atoms and having an arrangement of molecular bonds as in the benzene ring or in the quinone ring, but does not include any such molecular structure in which one or more pyrimidine rings are the only modified aromatic rings present; (c) For the purposes of headings 2902, 2907 and 3817, the term "alkyl" describes any saturated acyclic hydrocarbon group having six or more carbon atoms or, subject to note 1 to

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