Thiazole-4-Carboxylic Acid Ethyl Ester from Mexico
This aromatic thiazole derivative with ester functionality meets HTS 2934.10.10.00 criteria per U.S. note 3. Serves as intermediate for pharmaceutical and agrochemical synthesis.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6093.5%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
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
• Provide NMR/GC-MS spectra confirming thiazole ring integrity and ester purity
• Use HDPE drums with nitrogen blanketing for oxidative-sensitive compounds
• Include downstream synthesis declaration to justify chemical intermediate status