dihematoporphyrin ether
21H,23H-Porphine-2,18-dipropanoic acid, 7-(1-(1-(8,12-bis(2-carboxyethyl)-17-(1-hydroxyethyl)-3,7,13,18-tetramethyl-21H,23H-porphin-2-yl)ethoxy)ethyl)-12-(1-hydroxyethyl)-3,8,13,17-tetramethyl-