(E)-3-[2,5-Bis-acetoxymethyl-4-((E)-2-ethoxycarbonyl-vinyl)-1H-pyrrol-3-yl]-acrylic acid ethyl ester

5,5'-((3,4-bis(3-ethoxy-3-oxopropyl)-1H-pyrrole-2,5-diyl)bis(methylene))bis(3,4-diethyl-1H-pyrrole-2-carboxylic acid)

5,5'-((3,4-bis(3-ethoxy-3-oxopropyl)-1H-pyrrole-2,5-diyl)bis(methylene))bis(4-ethyl-3-methyl-1H-pyrrole-2-carboxylic acid)

2,5-Bis(5'-benzyloxycarbonyl-3',4'-diethylpyrrol-2'-ylmethyl)-3,4-di(2-ethoxycarbonylvinyl)pyrrole