2,4,2',4'-tetramethyl-[3,3']bipyrrolyl-5,5'-dicarboxylic acid diethyl ester
2,4,2',4'-Tetramethyl-1H,1'H-[3,3']bipyrrolyl-5,5'-dicarboxylic acid diethyl ester
2,4,2',4'-Tetramethyl-3,3'-bipyrrol-5,5'-dicarbonsaeure-diethylester
2,4,2',4'-Tetramethyl-[3,3']bipyrrolyl-5,5'-dicarbonsaeure-diaethylester
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