(SP-4-1)-((4,4',4'',4'''-(21H,23H-Porphine-5,10,15,20-tetrayl)tetrakis(1-methylpyridiniumato))(2-)-N21,N22,N23,N24)nickel(4+) 48242-71-3 Nickel(4+), ((4,4',4'',4'''-(21H,23H-porphine-5,10,15,20-tetrayl)tetrakis(1-methylpyridiniumato))(2-)-N21,N22,N23,N24)-, (SP-4-1)- Nickel(II) tetrakis(4-N-methylpyridyl)porphine