1-butyl-3-cyano-6-hydroxy-4-methyl-pyrid-2-one;1-butyl-3-cyano-5-hydroxy-4-methyl-2-pyridone;1-butyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxonicotinonitrile;1-butyl-6-hydroxy-4-methyl-2-oxo-1,2-dihydro-pyridine-3-carbonitrile;1-butyl-4-methyl-2,6-dioxo-1,2,3,6-tetrahydro-pyridine-3-carbonitrile;
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