Also Called: Cobaltate(1-), [3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxybenzenesulfonamidato(2-)][1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphthalenolato(2-)]-, hydrogen;Cobaltate(1-), [3-[2-[4,5-dihydro-3-methyl-5-(oxo-.kappa.O)-1-phenyl-1H-pyrazol-4-yl]diazenyl-.kappa.N1]-4-(hydroxy-.kappa.O)benzenesulfonamidato(2-)][1-[2-[2-(hydroxy-.kappa.O)-5-nitrophenyl]diazenyl-.kappa.N1]-2-naphthalenolato(2-)-.kappa.O]-, hydrogen (1:1);Cobalt and cobalt compounds