dibenzyl 4,4'-bis(2-acetoxyethyl)-3,3'-dimethylpyrromethane-5,5'-dicarboxylate
dibenzyl 3,3'-dimethyl-4,4'-bis(methoxycarbonylmethyl)pyrromethane-5,5'-dicarboxylate
dibenzyl 3,3'-bismethyl-4,4'-bis-(2-hydroxyethyl)pyrromethane-5,5'-dicarboxylate
benzyl 3-(benzyloxycarbonylmethyl)-4,5-dimethylpyrrole-2-carboxylate
benzyl 3-(methoxycarbonylmethyl)-4,5-dimethylpyrrole-2-carboxylate