3-Cyano-6-hydroxy-4-methyl-5-(4-methylphenylazo)-2(1H)-pyridone

1,2-dihydro-6-hydroxy-4-methyl-2-oxo-5-[(p-tolyl)azo]nicotinonitrile

2-Oxo-4-methyl-5-[(4-methylphenyl)azo]-6-hydroxy-1,2-dihydro-3-pyridinecarbonitrile

1,2-dihydro-6-hydroxy-4-methyl-5-[(4-methylphenyl)azo]-2-oxo-3-Pyridinecarbonitrile