2-(2-((Carboxymethyl)thio)ethyl)-4-thiazolidinecarboxylic acid 2-ethyl ester 4-Thiazolidinecarboxylic acid, 2-(2-((2-ethoxy-2-oxoethyl)thio)ethyl)- 53943-88-7 EINECS 258-879-3 Letosteina [INN-Spanish] Letosteine Letosteine [INN] Letosteinum [INN-Latin]