ethyl 3-(ethoxycarbonylmethyl)-4-methylpyrrole-2-carboxylate

ethyl 3-(2-ethoxy-2-oxoethyl)-5-iodo-4-methyl-1H-pyrrole-2-carboxylate

3,4'-bis-(2-hydroxyethyl)-3',4-dimethylpyrromethane

benzyl 3-(methoxycarbonylmethyl)-4'-(ethoxycarbonylmethyl)-3',4-dimethyl-5'-ethoxycarbonylpyrromethane-5-carboxylate