Thiazole-4-Carboxylic Acid from Mexico
Thiazole-4-carboxylic acid contains an unfused thiazole ring with carboxylic acid substitution at position 4, used in pharmaceutical synthesis. Classified under HTS 2934.10.90.00 as the thiazole ring structure determines heading per Chapter 29 precedence over carboxylic acid classification.
Duty Rate — Mexico → 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
• Neutralize residual acidity with proper packaging to prevent corrosion
• Provide melting point and titration data confirming carboxylic acid purity
• Declare synthetic intermediates status to expedite pharmaceutical import