16755-93-4 Magnesate(2-), (7,12-diethyl-3,8,13,17-tetramethyl-21H,23H-porphine-2,18-dipropanoato(4-)-N21,N22,N23,N24)-, dihydrogen, (SP-4-2)- Magnesium mesoporphyrin Mg Mesoporphyrin Mg-Mesoporphyrin