α-(4-Nitrophenylazo)-4'-chloro-2',5'-dimethoxyacetoacetanilide

4'-Chloro-2',5'-dimethoxy-α-(4-nitrophenylazo)acetoacetanilide

2-(4-Nitrophenylazo)-acetoaceto-4'-chloro-2',5'-dimethoxyanilide

N-(4-Chloro-2,5-dimethoxyphenyl)-2-[(4-nitrophenyl)azo-3-oxo-butanamide

N-(4-chloro-2,5-dimethoxyphenyl)-2-[(4-nitrophenyl)azo]-3-oxobutyramide