3-Pyridinecarbonitrile, 5-((3,4-dichlorophenyl)azo)-1,2-dihydro-6-hydroxy-1,4-dimethyl-2-oxo- 5-((3,4-Dichlorophenyl)azo)-1,2-dihydro-6-hydroxy-1,4-dimethyl-2-oxonicotinonitrile 83249-52-9 EINECS 280-322-8