2930.90.49.50/Methanethiosulfonic Acid S-Methyl Ester/Canada

Methanethiosulfonic Acid S-Methyl Ester from Canada

Methanethiosulfonic acid S-methyl ester is an organo-sulfur compound featuring a thioester functional group where sulfur is directly linked to carbon. Classified under HTS 2930.90.4950 as 'other' organo-sulfur acids, it falls within Chapter 29's scope for separate chemically defined organic compounds containing sulfur directly bonded to carbon. Primarily used as a reagent in organic synthesis and protein modification research.

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

• Provide detailed chemical purity certificates (≥98%) and CAS number (2940-92-1) documentation to verify classification as chemically defined compound

• Ensure SDS includes sulfur-carbon bonding confirmation to distinguish from sulfonated derivatives excluded from heading 2930

• Declare exact concentration if diluted in solvents; solutions solely for transport qualify under Chapter 29 note (e)