14640-23-4 26334-85-0 Sn-Tpph Tetraphenylporphyrin-Sn(4+) Tin tetraphenylporphyrin Tin, (5,10,15,20-tetraphenyl-21H,23H-porphinato(2-)-N21,N22,N23,N24)-, (SP-4-1)-