Warfarin Sodium Precursor (4-Hydroxycoumarin Base) from Canada
4-Hydroxycoumarin base used to synthesize warfarin sodium, a pharmaceutical anticoagulant. Classified in HTS 2932.20.2500 for its specific aromatic lactone structure per subheading.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include DMF reference for pharma use; test for heavy metals per USP
• Pitfall: pharma intermediates sometimes misentered under 2940