Synonyms: Cobalt,[2,7,12,17-tetraethyl-3,8,13,18-tetramethyl-21H,23H-porphinato(2-)-N21,N22,N23,N24]-,(SP-4-1)-; Cobalt, [2,7,12,17-tetraethyl-3,8,13,18-tetramethylporphinato(2-)]-(8CI); Cobalt, [etioporphyrin 1-ato(2-)]- (7CI); Etioporphyrin I, Co deriv.(6CI); 21H,23H-Porphine, 2,7,12,17-tetraethyl-3,8,13,18-tetramethyl-, cobaltcomplex; Cobalt etioporphyrin I; Cobalt(2+) etioporphyrin; Cobalt(II)etioporphyrin