2930.90.49.50/2-Mercaptobenzoic Acid/Canada

2-Mercaptobenzoic Acid from Canada

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 — Canada → 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)

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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