Drugs
Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds: > Other: > Other: > Other: > Drugs
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 2934.99.47.00
Adenosine Triphosphate (ATP) Sodium Salt
ATP sodium salt is a chemically defined nucleic acid derivative used as a pharmaceutical drug in biochemical research and medical treatments for energy metabolism disorders. It falls under HTS 2934.99.4700 as a nucleic acid salt classified as a drug, containing a heterocyclic purine base structure. This pure compound meets Chapter 29 requirements for separate chemically defined organic compounds.
5-Fluorouracil
5-Fluorouracil is a fluorinated pyrimidine analog used as an antineoplastic drug for cancer chemotherapy. This chemically defined heterocyclic compound with nitrogen heteroatoms qualifies under HTS 2934.99.4700 as 'other heterocyclic drugs.' Its pharmaceutical drug status distinguishes it from industrial chemicals.
Methotrexate
Methotrexate is a folic acid antagonist containing pteridine heterocyclic rings, used as an antineoplastic and immunosuppressant drug. Classified under HTS 2934.99.4700 as a pharmaceutical drug with 'other heterocyclic compounds' structure. Its complex ring system with multiple nitrogens defines its Chapter 29 placement.
Caffeine Anhydrous USP
Pharmaceutical grade caffeine anhydrous is a purine alkaloid (xanthine derivative) used in medications for respiratory stimulation and pain relief. This purine heterocyclic compound classifies under HTS 2934.99.4700 as a drug, distinct from food-grade or beverage use. Meets Chapter 29 criteria for chemically defined compounds.
Theophylline
Theophylline is a methylxanthine bronchodilator drug containing fused purine heterocyclic rings, used for asthma treatment. Falls under HTS 2934.99.4700 as a 'drug' heterocyclic compound per its pharmaceutical application and chemical definition. Excluded from earlier alkaloid headings due to specific drug status.
Allopurinol
Allopurinol is a hypoxanthine analog (purine heterocycle) used to treat gout by inhibiting xanthine oxidase. This chemically defined drug compound is properly classified under HTS 2934.99.4700 for other heterocyclic drugs. Its pharmaceutical purity distinguishes it from research chemicals.
Colchicine USP
Colchicine USP is an alkaloid drug containing a tropolone ring system (seven-membered heterocycle with oxygen), used for gout and Mediterranean fever. Classified as HTS 2934.99.4700 drug due to its complex heterocyclic structure and pharmaceutical use. Excluded from Chapter 29 alkaloid headings.
Acyclovir
Acyclovir is a guanosine nucleoside analog with a purine heterocyclic base, used as antiviral drug against herpes viruses. This acyclic nucleic acid derivative qualifies under HTS 2934.99.4700 as a pharmaceutical drug heterocyclic compound. Its specific antiviral therapeutic use defines classification.
Cidofovir
Cidofovir is a cytosine nucleotide analog (phosphonate nucleotide) used intravenously for cytomegalovirus retinitis in AIDS patients. As a chemically defined nucleic acid derivative drug with heterocyclic pyrimidine base, it falls under HTS 2934.99.4700. Contains phosphorus directly linked meeting Chapter 29 organo-inorganic criteria.
Lamivudine
Lamivudine is a cytidine nucleoside reverse transcriptase inhibitor used in HIV and hepatitis B treatment, featuring pyrimidine heterocyclic base. This nucleic acid derivative drug is classified under HTS 2934.99.4700 for other heterocyclic drugs. Chemically defined structure meets Chapter 29 pure compound requirements.
Mercaptopurine
Mercaptopurine (6-MP) is a purine antimetabolite chemotherapy drug with thiopurine heterocyclic structure, used in leukemia treatment. Falls under HTS 2934.99.4700 as organo-sulfur heterocyclic drug, excluded from heading 2930 by classification notes. Light-sensitive pharmaceutical requiring special handling.
Thioguanine
Thioguanine (6-TG) is a guanine analog chemotherapy drug containing fused purine heterocycle with sulfur substitution, used for acute myeloid leukemia. Classified HTS 2934.99.4700 as heterocyclic drug per numerical order rule over organo-sulfur heading 2930. Chemically defined active pharmaceutical ingredient.
Pentostatin
Pentostatin (deoxycoformycin) is a purine nucleoside analog adenosine deaminase inhibitor used in hairy cell leukemia, featuring complex purine heterocyclic system. HTS 2934.99.4700 classification as nucleic acid derivative drug. Highly potent requiring specialized handling.
Fludarabine Phosphate
Fludarabine phosphate is a purine nucleoside analog (adenosine derivative) prodrug for chronic lymphocytic leukemia, with phosphorylated sugar moiety. As chemically defined nucleic acid salt drug, classifies HTS 2934.99.4700 heterocyclic drugs. Phosphate group integral to structure.
Cladribine
Cladribine is a purine nucleoside analog (2-chlorodeoxyadenosine) used in hairy cell leukemia and multiple sclerosis, featuring chlorinated purine heterocycle. HTS 2934.99.4700 as halogenated heterocyclic drug per Chapter notes. Synthetic API meeting purity standards.