2-Thiazolidineacetic acid, 3-methyl-4-oxo-5-(1-piperidinyl)-, ethyl ester 3-Methyl-4-oxo-5-(1-piperidinyl)-2-thiazolidineacetic acid 63938-90-9 Ethyl-3-methyl-4-oxo-5-piperidino-2,alpha-thiazolidine acetate