Thioguanine from China
Thioguanine is a guanine analog with thiopurine structure used as antileukemic drug featuring aromatic heterocyclic rings. It qualifies for HTS 2934.99.30.00 classification as a pharmaceutical drug compound.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals: 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
• Document insolubility profile and recommend micronization for bioavailability enhancement
• Provide heavy metals testing results below 10 ppm per USP requirements
• Include anaerobic packaging specifications to prevent oxidation during transit