1-Butyl-5-((4-(4-chlorobenzoyl)-2-nitrophenyl)azo)-1,2-dihydro-6-hydroxy-4-methyl-2-oxonicotinonitrile 3-Pyridinecarbonitrile, 1-butyl-5-((4-(4-chlorobenzoyl)-2-nitrophenyl)azo)-1,2-dihydro-6-hydroxy-4-methyl-2-oxo- 90729-40-1 EINECS 292-678-1