Chemical Formula: C68H74N8O11

3-[14-(1-{1-[15,19-bis(2-carboxyethyl)-9-(1-hydroxyethyl)-5,10,14,20-tetramethyl-21,22,23,24-tetraazapentacyclo[16.2.1.1^{3,6}.1^{8,11}.1^{13,16}]tetracosa-1(21),2,4,6,8,10,12,14,16(22),17,19-undecaen-4-yl]ethoxy}ethyl)-20-(2-carboxyethyl)-9-(1-hydroxyethyl)-5,10,15,19-tetramethyl-21,22,23,24-tetraazapentacyclo[16.2.1.1^{3,6}.1^{8,11}.1^{13,16}]tetracosa-1(21),2,4,6,8,10,12,14,16(22),17,19-undecaen-4-yl]propanoic acid

3-[13-[1-[1-[8,12-Bis(2-carboxyethyl)-17-(1-hydroxyethyl)-3,7,13,18-tetramethyl-21,24-dihydroporphyrin-2-yl]ethoxy]ethyl]-18-(2-carboxyethyl)-8-(1-hydroxyethyl)-3,7,12,17-tetramethyl-22,23-dihydroporphyrin-2-yl]propanoic acid