3-pyridinecarbonitrile, 5-ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo- 5-ethyl-6-hydroxy-4-methyl-2-oxo-1,2-dihydropyridine-3-carbonitrile InChI=1/C9H10N2O2/c1-3-6-5(2)7(4-10)9(13)11-8(6)12/h3H2,1-2H3,(H2,11,12,13