Synonyms: Cobaltate(1-), (2,4-dihydro-4-(2-(2-(hydroxy-kappaO)-5-nitrophenyl)diazenyl-kappaN1)-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)-kappaO3)(1-(2-(2-(hydroxy-kappaO)-5-nitrophenyl)diazenyl-kappaN1)-2-naphthalenolato(2-)-kappaO)-, sodium (1:1);Cobaltate(1-), (2,4-dihydro-4-((2-(hydroxy-kappaO)-5-nitrophenyl)azo-kappaN1)-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)-kappaO3)(1-((2-(hydroxy-kappaO)-5-nitrophenyl)azo-kappaN1)-2-naphthalenolato(2-)-kappaO)-, 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;Sodium (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-naphtholato(2-))cobaltate(1-)