Purine from China
Purine is the parent bicyclic heterocyclic compound (imidazole fused with pyrimidine) forming the core of adenine and guanine. Classified in HTS 2934.99.90.01 as other heterocyclic compounds, serving as a nucleic acid base precursor.
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
• Submit structural formula and IUPAC name in entry summary to prevent classification disputes
• Use UN-approved packaging for air shipment due to potential dust explosion hazard
• Maintain segregation from oxidizing agents during storage per SDS requirements