Thiazole-4-Carboxylic Acid from Mexico
Thiazole-4-carboxylic acid features an aromatic thiazole ring with carboxylic acid at position 4, used in pharmaceutical synthesis. HTS 2934.10.20.00 as 'other' aromatic thiazole per rule that acid-function compounds classified by heterocyclic parent. Chapter 29 numerical precedence applies.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Titration analysis confirming carboxylic acid content on COA
• Specify 'heterocyclic acid' nomenclature on entry documents
• Avoid sodium salt form which follows acid classification per Chapter note 3(C)