3 4-DIHYDROXY-THIOPHENE-2 5-DICARBOXYLI&

Sodium 2,5-bis(ethoxycarbonyl)-thiophene-3,4-bis(olate)

3,4-Dihydroxythiophene-2,5-dicarboxylic acid diethyl ester, disodium salt

3,4-Dihydroxy-2,5-thiophenedicarboxylic acid 2,5-diethyl ester sodium salt