1,2-Propanediol, 3-((4-((2-chloro-4,6-dinitrophenyl)azo)-1-naphthalenyl)amino)- 3-((4-((2-Chloro-4,6-dinitrophenyl)azo)naphthyl)amino)propane-1,2-diol 69828-87-1 EINECS 274-136-6