105522-89-2 2-Amino-3-cyano-4-methyl-5-thiopheneacetic acid ethyl ester 2-Thiopheneacetic acid, 5-amino-4-cyano-3-methyl-, ethyl ester 5-Amino-4-cyano-3-methyl-2-thiopheneacetic acid ethyl ester BRN 5540098