Aminophylline Base from China
Aminophylline base, theophylline ethylenediamine complex, qualifies as heterocyclic nitrogen compound before salt formation considerations. U.S. note 3 product in 2933.99.79.00. Used in respiratory therapy intermediates.
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
• Specify base vs salt form clearly with assay method documentation
• Test for ethylenediamine content to confirm stoichiometric ratio
• Declare moisture content affecting stability during customs valuation