Ethyl 3-methyl-1H-pyrazole-5-carboxylate from Mexico
This ester of a pyrazole carboxylic acid features an unfused aromatic pyrazole ring, classified specifically under HTS 2933.19.37.00 per additional U.S. note 3 to section VI. The ester follows the acid's classification per chapter notes, used primarily as a pharmaceutical intermediate.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Chapter note requires esters to follow the parent acid's heading; include structural formula in entry docs
• Test for ester hydrolysis stability during transport to prevent reclassification as free acid
• Declare exact purity level as impurities may affect 'chemically defined' status