(4,4',4'',4'''-(21H,23H)-Porphine-5,10,15,20-tetrayl)tetrakis(1-methylpyridinium) 36951-72-1 38673-65-3 Mesotetra(4-N-methylpyridyl)porphine TMPYP Tetra(4-N-methylpyridyl)porphine Tetrakis(4-N-methylpyridyl)porphine Tetrakis(N-methyl-4-pyridino)porphine meso-Tetra(4-N-methylpyridyl)porphine meso-Tetra(4-N-methylpyridyl)porphine tetraperchlorate meso-Tetrakis(2-N-methylpyridyl)porphine meso-Tetrakis(N-methyl-4-pyridinium)phenyl porphyrin