5,10,15,20-Tetra(4-N-sulfoethylpyridinim)porphyrin 5-Tnspp 88954-77-2 94693-46-6 Pyridinium, 4,4',4'',4'''-(21H,23H-porphine-5,10,15,20-tetrayl)tetrakis(1-(2-sulfoethyl)-, tetrahydroxide, tetrakis (inner salt) Pyridinium, 4,4',4'',4'''-(21H,23H-porphine-5,10,15,20-tetrayl)tetrakis(1-(2-sulfoethyl)-, tetrahydroxide, tetrakis(inner salt)