21H,23H-Porphine-2,7,12,17-tetrapropanoic acid, 3,8,13,18-tetramethyl-, sodium, cobalt complex Cobalt complex of sodium salt coproporphyrin I Cobaltate(4-), (3,8,13,18-tetramethyl-21H,23H-porphine-2,7,12,17-tetrapropanoato(6-)-N(sup 21),N(sup 22),N(sup 23),N(sup 24))-, tetrasodium, (SP-4-1)- GF9531000