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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)