4-((2-((5-Chloro-2-cyanophenyl)azo)-5-(diethylamino)phenyl)amino)-4-oxobutyric acid 62163-33-1 Butanoic acid, 4-((2-((5-chloro-2-cyanophenyl)azo)-5-(diethylamino)phenyl)amino)-4-oxo- EINECS 263-443-0