tert-butyl 3,3'-bis<β-(methoxycarbonyl)ethyl>-4,4'--5'-<(benzyloxy)carbonyl>dipyrrylmethane-5-carboxylate

tert-butyl 3,4'-bis<β-(methoxycarbonyl)ethyl>-4,3'-bis<(methoxycarbonyl)methyl>dipyrrylmethane-5-carboxylate

tert-butyl 3,3'-bis<β-(methoxycarbonyl)ethyl>-4,4'-bis<(methoxycarbonyl)methyl>-5'-fromyldipyrrylmethane-5-carboxylate

5,10-dihydro-3,7-bis(methoxycarbonylethyl)-2,8-bis(methoxycarbonylmethyl)-9-t-butoxycarbonyldipyrrin-9-carboxylate

tert-butyl 3,3'-bis<β-(methoxycarbonyl)ethyl>-4,4'-bis<(methoxycarbonyl)methyl>dipyrrylmethane-5-carboxylate