5-18-12-00222 (Beilstein Handbook Reference) 5919-29-9 BRN 1318072 Benzo(b)thiophene-3-carboxylic acid, 4,5,6,7-tetrahydro-2-(acetylamino)-, ethyl ester Ethyl 4,5,6,7-tetrahydro-2-(acetylamino)benzo(b)thiophene-3-carboxylate