Dyphylline USP Powder from China
Dyphylline is a xanthine derivative with pyrimidine structure, used as a theophylline alternative in bronchodilators. HTS 2933.59.70.00 applies to this aromatic heterocyclic compound listed in U.S. note 3. It is imported as high-purity USP grade.
Duty Rate — China → 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
• Ensure chiral purity documentation if enantiomer-specific
• Avoid retail packaging to stay in chemical classification vs
• Chapter 30
• Test for related substances per USP monograph before export