1950-36-3 2-Thiazolidineacetic acid, 4-carboxy-alpha-phenyl-, 2-ethyl ester 2-Thiazolidineacetic acid, 4-carboxy-alpha-phenyl-, alpha-ethyl ester Ethyl-4-carboxy alpha-phenyl-1,2-thiazolidine acetate Leucogen Leukogen Leyk NSC 400257