2-Mercaptobenzoic Acid from Japan
2-Mercaptobenzoic acid contains a thiol group ortho to carboxylic acid on benzene ring, classified under HTS 2930.90.4950 as other organo-sulfur acid. Direct C-S bonding qualifies for heading 2930; aromatic structure doesn't change classification. Used in synthesis of thiochromones and dyes.
Duty Rate — Japan → 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
• Include HPLC purity (>98%) and tautomer confirmation (thiol vs thione form)
• Verify no sulfonation occurred during synthesis per exclusion note 6
• Package under nitrogen to prevent air oxidation during transport