2-Amino-4-phenylthiophene-3-carboxylic acid ethyl ester 4815-36-5 5-18-12-00255 (Beilstein Handbook Reference) Amino-2 ethoxycarbonyl-3 phenyl-4 thiophene [French] BRN 1429620 Ethyl 2-amino-4-phenylthiophene-3-carboxylate NSC 149683 Thiophene-3-carboxylic acid, 2-amino-4-phenyl-, ethyl ester