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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If oxygen heterocyclic function emphasized
Certain nucleoside ethers classify under heading 2932
If in fixed-dose antiretroviral combinations
Multi-drug HIV formulations become Chapter 30 medicaments
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Import Tips & Compliance
• WHO prequalified supplier documentation; chiral purity verification (>99.5% S-enantiomer); avoid generic name confusion with chemical synonyms
Related Products 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.