Synonyms: 5,10,15,20-Tetrakis-(N-methyl-4-pyridyl)-21,23H-porphyrin tetratosylate;4,4',4'',4'''-porphyrin-5,10,15,20-tetrayltetrakis(1-methylpyridinium) tetrakis(4-methylbenzenesulfonate);4-methylbenzenesulfonate; 5,10,15,20-tetrakis(1-methylpyridin-1-ium-4-yl)-21,22-dihydroporphyrin;