Tetrazole API Intermediate from China
Tetrazole contains four nitrogen atoms in a five-membered aromatic ring, classified as nitrogen heterocycle only under HTS 2933.99.82. Critical for sartans blood pressure medications.
Duty Rate — China → United States
19%
Rate breakdown
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
Import Tips
• ANDA documentation for generic APIs; stability under acid conditions; explosive hazard declarations