1-Butyl-5-((4-chlorophenyl)azo)-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridinecarbonitrile 1-Butyl-5-((4-chlorophenyl)azo)-1,2-dihydro-6-hydroxy-4-methyl-2-oxonicotinonitrile 3-Pyridinecarbonitrile, 1-butyl-5-((4-chlorophenyl)azo)-1,2-dihydro-6-hydroxy-4-methyl-2-oxo- 69808-32-8 EINECS 274-126-1