Also Called: Cobaltate(1-), [2,4-dihydro-4-[(2-hydroxy- 5-nitrophenyl)azo]-5-methyl-2-phenyl-3H-pyrazol -3-onato(2-)][1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphthalenolat o(2-)]-, sodium;Cobaltate(1-), [2,4-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)][1-[(2-hydroxy-5-nitrophenyl)azo]-2-naphthalenolato(2-)]-, sodium;Cobaltate(1-), [2,4-dihydro-4-[2-[2-(hydroxy-.kappa.O)-5-nitrophenyl]diazenyl-.kappa.N1]-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)-.kappa.O3][1-[2-[2-(hydroxy-.kappa.O)-5-nitrophenyl]diazenyl-.kappa.N1]-2-naphthalenolato(2-)-.kappa.O]-, sodium (1:1);Cobalt and cobalt compounds