Synonyms: Benzo(b)cyclobuta(d)thiophene-2,2a(7bH)-dicarboxylic acid, 1-(1-pyrrolidinyl)-, dimethyl ester;Benzo[b]cyclobuta[d]thiophene-2,2a(7bH)-dicarboxylic acid, 1-(1-pyrrolidinyl)-, dimethyl ester;cyclobuta[b][1]benzothiophene-2,2a(7bH)-dicarboxylic acid, 1-(1-pyrrolidinyl)-, dimethyl ester