Synonyms: 5-[(3,4-dichlorophenyl)azo]-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-1-(phenylamino)nicotinonitrile;5-[(3,4-dichlorophenyl)azo]-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-1-(phenylamino)-3-pyridinecarbonitril;5-[(3,4-dichlorophenyl)azo]-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-1-(phenylamino)-3-Pyridinecarbonitrile;3-Pyridinecarbonitrile, 5-[(3,4-dichlorophenyl)azo] -1,2-dihydro-6-hydroxy-4-methyl-2-oxo-1-(phenylamino )-;1-Anilino-3-cyano-5-(3,4-dichlorophenylazo)-6-hydroxy-4-methyl-2(1H)-pyridone;3-Pyridinecarbonitrile, 5-(2-(3,4-dichlorophenyl)diazenyl)-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-1-(phenylamino)-;Einecs 269-305-6