Aminophylline USP Powder from China
Aminophylline is a heterocyclic compound containing a xanthine (purine) structure with pyrimidine rings, used as a bronchodilator for asthma treatment. It falls under HTS 2933.59.59.00 as a drug featuring pyrimidine heteroatoms not specified elsewhere in the subheading. This classification applies to its pure chemical form for pharmaceutical use.
Duty Rate — China → United States
16.2%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Provide FDA Drug Master File and Certificate of Analysis confirming USP purity and pyrimidine structure to avoid reclassification
• Ensure shipments include stability data as required for temperature-sensitive pharmaceuticals to prevent duty disputes
• Declare exact isomer content; mixtures may shift to earlier headings per Chapter 29 note 3(b)