1-butyl-5-[(2-chloro-4-nitrophenyl)azo]-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-Pyridinecarbonitrile;N-Butyl-3-(2-chloro-4-nitrophenylhydrazono)-1-cyano-2-methylprop-1-ene-1,3-dicarboximide
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