52846-56-7 75601-68-2 Butanamide, N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-2-((4-nitrophenyl)azo)-3-oxo- EINECS 258-221-5 N-(2,3-Dihydro-2-oxo-1H-benzimidazol-5-yl)-2-((4-nitrophenyl)azo)-3-oxobutyramide