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
100%
Rate breakdown
9903.04.6095.8%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
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