2-Mercaptobenzoic Acid from Mexico
2-Mercaptobenzoic acid (thiosalicylic acid) combines aromatic carboxylic acid with ortho-mercapto group. Classified in HTS 2930.90.4920 as aromatic mercaptocarboxylic acid under organo-sulfur compounds. Key intermediate for thioindigo dyes and pharmaceuticals.
Duty Rate — Mexico → United States
4.2%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Verify aromatic ring via UV spectroscopy; CAS 49-58-3 confirms 2930.90.4920 status
• Light-sensitive; ship in amber containers with nitrogen blanket to prevent oxidation
• Differentiate from 2930.30 by confirming free mercapto vs thiocarbonate ester