3-Cyano-1-(2-ethylhexyl)-6-hydroxy-4-methyl-5-(4-methoxy-2-nitrophenylazo)pyridin-2(1H)-one

1-(2-ethylhexyl)-1,2-dihydro-6-hydroxy-5-[(4-methoxy-2-nitrophenyl)azo]-4-methyl-2-oxonicotinonitrile