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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If amino acid function emphasized
Nucleoside amino groups invoke later oxygen-function headings.
If diagnostic reagent kits
Lab reagent end-use excludes pharmaceutical chemicals.
If finished ophthalmic product
Packaged medicaments shift to Chapter 30.
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Import Tips & Compliance
• Optical purity certificate essential for chiral pyrimidine derivatives
• Temperature-controlled shipping manifests prevent degradation claims
• Distinguish from trifluridine sodium salt which may classify differently
Related Products 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.
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.