Purine Base (Adenine) from China
Adenine is a purine nucleobase with a fused pyrimidine-imidazole ring system containing four nitrogen hetero-atoms. Falls under HTS 2933.99.82 as other aromatic nitrogen heterocycles before nucleic acid provisions. Used in biochemical research and vitamin 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
• Nucleic acid-free certification; biotech end-use declaration; HPLC purity reports