Caffeine Anhydrous USP
Caffeine anhydrous is a purine alkaloid featuring pyrimidine rings, used in pharmaceuticals, energy products, and as a chemical standard. It is covered by HTS 2933.59.70.00 as an aromatic heterocyclic compound described in additional U.S. note 3 to section VI. The classification reflects its chemically defined structure.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for other purine derivatives not in note 3
Heading 2939 captures residual heterocyclic compounds following chapter note on last numerical order.
If imported as diagnostic reagent mixture
Prepared lab reagents not purely chemical compounds shift to Chapter 38.
If put up in medicaments for retail sale
Chapter notes exclude finished medicaments from Chapter 29.
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Import Tips & Compliance
• Submit USP certificate and batch analysis to confirm anhydrous form and purity above 99%
• Declare exact CAS number (58-08-2) on entry docs to match note 3 specifications
• Watch for contamination claims; test for heavy metals per pharmacopeia standards pre-shipment
Related Products under HTS 2933.59.70.00
Aminophylline USP
Aminophylline is a heterocyclic compound containing a xanthine (purine) structure with pyrimidine rings, used as a bronchodilator for asthma treatment. It falls under HTS 2933.59.70.00 as an aromatic pyrimidine derivative listed in additional U.S. note 3 to section VI for specific organic chemicals. This classification applies to its pure chemical form for pharmaceutical use.
Theobromine Powder
Theobromine is a methylxanthine alkaloid with fused pyrimidine rings in its purine structure, used in pharmaceuticals and as a chemical intermediate. Classified under HTS 2933.59.70.00 due to its aromatic nature and inclusion in additional U.S. note 3 to section VI. It qualifies as a separate chemically defined heterocyclic compound.
Paraxanthine Reference Standard
Paraxanthine is a caffeine metabolite with a xanthine (pyrimidine-containing) structure, supplied as analytical reference material. Falls under HTS 2933.59.70.00 for aromatic pyrimidines listed in additional U.S. note 3. Used in lab research and pharma development.
Theophylline Monohydrate
Theophylline monohydrate is a methylxanthine with pyrimidine rings, used in respiratory medications. Classified in HTS 2933.59.70.00 as an aromatic compound per additional U.S. note 3 to section VI. The hydrate form remains a separate chemically defined organic compound.
Dyphylline USP Powder
Dyphylline is a xanthine derivative with pyrimidine structure, used as a theophylline alternative in bronchodilators. HTS 2933.59.70.00 applies to this aromatic heterocyclic compound listed in U.S. note 3. It is imported as high-purity USP grade.
Proxyphylline Pharmaceutical Grade
Proxyphylline, a hydroxyethyltheophylline with pyrimidine rings, serves as a mild bronchodilator. Covered under HTS 2933.59.70.00 for its aromatic pyrimidine structure in additional U.S. note 3. Supplied for API manufacturing.