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;Einecs 289-326-4
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