t-butyl 3,3'-dimethyl-4-ethyl-4'-(methoxycarbonylmethyl)-5'-carboxy-dipyrrylmethane-5-carboxylate

2,8-bis-(2-acetoxyethyl)-13,17-bis-(2-methoxycarbonylethyl)-3,7,12,18-tetramethylporphin

dibenzyl 3,4'-bis(2-hydroxyethyl)-4,3'-dimethylpyrromethane-5,5'-di-carboxylate

dibenzyl 4,4'-bis(2-acetoxyethyl)-3,3'-dimethylpyrromethane-5,5'-dicarboxylate

2,8-bis-(2-hydroxyethyl)-13,17-bis-(2-methoxycarbonylethyl)-3,7,12,18-tetramethylporphin