3,3'-dimethyl-4,4'-bis-(2-acetoxyethyl)pyrromethane-5,5'-dicarboxylic acid

dibenzyl 3,3'-bismethyl-4,4'-bis-(2-hydroxyethyl)pyrromethane-5,5'-dicarboxylate

2,8-bis-(2-chloroethyl)-6,7-bis-(2-methoxycarbonylethyl)-3,7,12,18-tetramethylporphin