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TETRAETHYL 1,1'-(1,4-PHENYLENE)BIS(2,5-DIMETHYL-1H-PYRROLE-3,4-DICARBOXYLATE) TETRAETHYL 1,1'-(1,4-PHENYLENE)BIS(2,5-DIMETHYL-1H-PYRROLE-3,4-DICARBOXYLATE)