Ethyl 2-Mercaptoacetate from Mexico
Ethyl 2-mercaptoacetate (HSCH₂CO₂Et) is a mercaptoacetic acid ester classified as an organo-sulfur acid derivative under HTS 2930.90.4950. The thiol (-SH) group provides sulfur directly linked to carbon, fitting Chapter 29's definition of organo-sulfur compounds excluding sulfonated types. Used in polymer synthesis and as pharmaceutical intermediate.
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
• Include NMR spectra confirming -SH group position to validate organo-sulfur acid classification versus mere thiols
• Label containers with stabilizer content if added for transport stability per Chapter 29 note (f)
• Avoid bulk packaging that suggests 'preparation' status which shifts to Chapter 38