31778-10-6 71872-62-3 Benzoic acid, 2-((3-(((2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)amino)carbonyl)-2-hydroxy-1-naphthalenyl)azo)-, butyl ester Butyl 2-((3-(((2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)amino)carbonyl)-2-hydroxy-1-naphthyl)azo)benzoate EINECS 250-800-0