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Ethyl 5-formyl-2,4-dimethyl-1H-pyrrole-3-carboxylate ethyl 4-(2-methoxycarbonylethyl)-3,5-dimethyl-1H-pyrrole-2-carboxylate 4-ETHOXYCARBONYL-3-METHYL PYRROL-2-CARBOXYLIC ACID METHYL 5-(BENZYLOXYCARBONYL)-2,4-DIMETHYL-3-PYRROLEPROPIONATE 3,4-DIMETHYL-1H-PYRROLE-2-CARBOXYLIC ACID ETHYL ESTER 4-(2-CARBOXYETHYL)-3,5-DIMETHYLPYRROLE-2-CARBOXYLIC ACID, ETHYL ETHER TERT-BUTYL 3,4,5-TRIMETHYL-2-PYRROLECARBOXYLATE