11129-87-6 2-((4-Chloro-2-nitrophenyl)azo)-N-(2,4-dimethylphenyl)-3-oxobutyramide 50642-21-2 6486-26-6 7538-53-6 Butanamide, 2-((4-chloro-2-nitrophenyl)azo)-N-(2,4-dimethylphenyl)-3-oxo- EINECS 229-357-2