5-(2-Aminoethyl)-4-methylthiazole from Mexico
Intermediate in thiamine synthesis featuring substituted aromatic thiazole ring with aminoethyl side chain. Classified HTS 2934.10.20.00 as principal thiazole heterocycle per Chapter 29 last-in-order rule. Chemically defined for pharmaceutical production.
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
• Reference to thiamine synthesis pathway supports heterocyclic classification
• GC-MS analysis verifying thiazole purity essential
• Distinguish from polymer precursors via molecular weight certification