3,4-ETHYLENEDIOXOTHIOPHENE-2,5-DICARBOXYLIC ACID; 2,3-Dihydro-thieno[3,4-b]-p-dioxin-5,7-dicarboxylic acid; Thieno[3,4-B]-1,4-Dioxin-5,7-DicarboxylicAcid,2,3-Dihydro-; 3,4-Ethylendioxythiophen-2,5-dicarbonsure
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