dibenzyl 3,4'-bis(ethoxycarbonyl)-3',4-dimethyldipyrrylmethane-5,5'-dicarboxylate
benzyl 3-(ethoxycarbonyl)-4-methyl-5-formyl-2-pyrrolecarboxylate
benzyl 3-(ethoxycarbonyl)-4-methyl-5-(hydroxymethyl)-2-pyrrolecarboxylate
benzyl 3-(ethoxycarbonyl)-4-methyl-2-pyrrolecarboxylate
3-ethoxycarbonyl-4-methylpyrrole-2-carboxylic acid