Purine from China
Purine is a fundamental aromatic heterocyclic compound forming the basis of adenine and guanine nucleobases. Falls under HTS 2934.99.44.00 as other aromatic heterocyclic compounds. Critical for nucleic acid research and pharmaceutical intermediates.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Submit structural formula and CAS (120-73-0) documentation to confirm classification as chemically defined compound
• Segregate from nucleosides/nucleotides to avoid Chapter 2934 nucleic acid headings
• Monitor for anti-dumping duties if sourced from specific countries