Xanthine Base Chemical from China
Xanthine is the parent compound of methylxanthines, featuring fused pyrimidine-imidazole rings. HTS 2933.59.70.00 classifies it as an aromatic pyrimidine per U.S. note 3. Used in biochemical research and synthesis.
Duty Rate — China → United States
19%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Provide molecular formula C5H4N4O2 and CAS 60-93-5 verification
• Ship under proper chemical hazard class (non-hazardous usually)
• Avoid mixtures exceeding stabilizer limits per chapter note (f)