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
14.2%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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