Theophylline Anhydrous from China
Theophylline is a methylxanthine derivative, an aromatic heterocyclic compound with only nitrogen hetero-atoms in its fused ring structure. Classified under HTS 2933.99.82 as other aromatic nitrogen heterocycles. Used primarily in bronchodilator medications and as a research chemical.
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 analytical specs confirming anhydrous form; FDA prior notice required for pharma intermediates; avoid classification issues by specifying non-dosage form