Purine Base from China
Purine (7H-imidazo[4,5-d]pyrimidine), the parent bicyclic nitrogen heterocycle of DNA/RNA bases. HTS 2933.99.9701 for unspecified nitrogen hetero-atom compounds used in biotech.
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
• NMR confirming unsubstituted purine; nucleosides go to 2934
• Biotech end-use statement prevents pharmaceutical reclassification
• RNase-free certification for molecular biology grade