2-[(2-hydroxy-5-nitrophenyl)azo]-3-oxo-n-phenylbutanamide cobalt complex (2:1) hydrogen bis[2-[(2-hydroxy-5-nitrophenyl)azo]-3-oxo-N-phenylbutyramidato(2-)]cobaltate(1-) Cobaltate(1-), bis2-2-(hydroxy-.kappa.O)-5-nitrophenylazo-.kappa.N1-3-(oxo-.kappa.O)-N-phenylbutanamidato(2-)-, hydrogen cobaltate(1-), bis[2-[(2-hydroxy-5-nitrophenyl)azo]-3-oxo-n- Cobaltate(1-), bis[2-[[2-(hydroxy-kappa N1]-3- (oxo-kappaO)-N-phenylbutanamidato(2-)]-, hydrogen O)-5-nitrophenyl]azo-kappa Solvent orange 45 (C.I. 11700)