1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-5-((2-nitrophenyl)azo)-2-oxo-3-pyridinecarbonitrile 1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-5-((2-nitrophenyl)azo)-2-oxonicotinonitrile 3-Pyridinecarbonitrile, 1-ethyl-1,2-dihydro-6-hydroxy-4-methyl-5-((2-nitrophenyl)azo)-2-oxo- 49744-25-4 EINECS 256-456-8