Theophylline USP Grade from Japan
Theophylline is a methylxanthine drug and bronchodilator, a purine derivative with fused heterocyclic nitrogen rings fitting 2933 classification. Specified in U.S. note 3 to section VI for this subheading. Used in respiratory medications and as chemical intermediate.
Duty Rate — Japan → United States
6.5%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Submit USP certificate and HPLC chromatograms verifying identity and impurity profile
• Declare therapeutic chemical status to prevent misclassification as finished dosage
• Comply with FDA prior notice requirements for bulk pharmaceutical chemicals