Other
Heterocyclic compounds with nitrogen hetero-atom(s) only: > Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure: > Other: > Drugs: > Other
Duty Rate (from China)
Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Products classified under HTS 2933.59.59.00
Aminophylline USP Powder
Aminophylline is a heterocyclic compound containing a xanthine (purine) structure with pyrimidine rings, used as a bronchodilator for asthma treatment. It falls under HTS 2933.59.59.00 as a drug featuring pyrimidine heteroatoms not specified elsewhere in the subheading. This classification applies to its pure chemical form for pharmaceutical use.
Theobromine Anhydrous Crystals
Theobromine is a methylxanthine alkaloid with fused pyrimidine-imidazole rings, used in pharmaceuticals and as a chemical intermediate. Classified under HTS 2933.59.59.00 for its pyrimidine-containing heterocyclic structure as an 'other' drug. Meets chapter notes for separate chemically defined compounds.
Allopurinol Micronized Powder
Allopurinol is a purine analog with pyrimidine ring structure used to treat gout by inhibiting xanthine oxidase. Falls under HTS 2933.59.59.00 as an 'other' pyrimidine heteroatom drug. Its heterocyclic nitrogen-only composition fits the heading precisely.
Flucytosine API Powder
Flucytosine is a fluorinated pyrimidine antifungal drug with nitrogen hetero-atoms only in its ring structure. Classified in HTS 2933.59.59.00 as an 'other' drug under pyrimidine compounds. Excludes halogen emphasis that might shift classification.
Idoxuridine Crystals
Idoxuridine is a iodinated pyrimidine nucleoside antiviral drug containing only nitrogen hetero-atoms in its core structure. HTS 2933.59.59.00 covers it as an 'other' pyrimidine drug, prioritizing ring structure over halogenation. Used in topical antiviral formulations.
Trifluridine Pure Substance
Trifluridine is a fluorinated pyrimidine nucleoside used as an antiviral agent in ophthalmic solutions. Classifies under HTS 2933.59.59.00 for pyrimidine ring drugs not elsewhere specified. Chapter notes confirm nitrogen hetero-atom priority.
Pentoxifylline Micronized
Pentoxifylline is a xanthine derivative with pyrimidine structure used for peripheral vascular disease treatment. Falls in HTS 2933.59.59.00 as an 'other' drug with pyrimidine heteroatoms. Chemical definition matches chapter scope.
Sulfadiazine Free Base
Sulfadiazine contains pyrimidine ring linked to sulfonamide, used in antibacterial treatment. HTS 2933.59.59.00 for pyrimidine drugs despite sulfur; organo-sulfur exclusion doesn't apply. Free base form for API use.
Propylthiouracil Crystals
Propylthiouracil features pyrimidine-2-thione structure for thyroid treatment. Classifies HTS 2933.59.59.00 as pyrimidine drug; sulfur directly linked but nitrogen ring principal. Used in hyperthyroidism therapy.
Dipyridamole Powder USP
Dipyridamole contains pyrimidine rings in its pyrimidopyrimidine structure, used as antiplatelet agent. HTS 2933.59.59.00 applies to this 'other' pyrimidine drug. Excludes coordination compounds per chapter notes.
Pyrimethamine Base
Pyrimethamine is a diaminopyrimidine antimalarial drug with nitrogen-only heteroatoms. Classified HTS 2933.59.59.00 as pyrimidine ring drug. Pure base form distinguishes from salts.