Synonyms: 2,5-Thiophenedicarboxylicacid, 3,4-dihydroxy-, diethyl ester (7CI,8CI,9CI);2,5-Dicarbethoxy-3,4-dihydroxythiophene;2,5-Diethoxycarbonyl-3,4-dihydroxythiophene;3,4-Dihydroxy-2,5-dicarbethoxythiophene;Dicetol;Diethyl3,4-dihydroxy-2,5-thiophenedicarboxylate;Diethyl3,4-dihydroxythiophen-2,5-dicarboxylate;NSC 57502;