1-(2-((4-((2-Chloro-4-nitrophenyl)azo)phenyl)ethylamino)ethyl)pyridinium chloride 36986-04-6 EINECS 253-300-0 Pyridinium, 1-(2-((4-((2-chloro-4-nitrophenyl)azo)phenyl)ethylamino)ethyl)-, chloride