Einecs 289-326-4

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

1-Butyl-5-(4-chloro-2-nitrophenylazo)-6-hydroxy-2-oxo-4-methyl-1,2-dihydropyridine-3-carbonitrile