Synonyms: Zinc(4+),[[4,4',4'',4'''-(21H,23H-porphine-5,10,15,20-tetrayl)tetrakis[1-methylpyridiniumato]](2-)-N21,N22,N23,N24]-,(SP-4-1)-; 21H,23H-Porphine, zinc(4+) deriv.; Pyridinium,4,4',4'',4'''-(21H,23H-porphine-5,10,15,20-tetrayl)tetrakis[1-methyl-, zinccomplex; Tetrakis(4-methylpyridyl)porphinato]zinc; Zinc5,10,15,20-tetrakis(1-methyl-4-pyridinio)-21H,23H-porphine; Zinctetrakis[4-(N-methylpyridinium)]porphine; Zn(II)meso-tetrakis(N-methylpyridinium-4-yl)porphyrin(4+); Zn-P 4