Synonyms: 3-Pyridinecarbonitrile, 5-(3-(5-cyano-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridinyl)-2-propen-1-ylidene)-1-ethyl-1,2,5,6-tetrahydro-4-methyl-2,6-dioxo-, compd. with N,N-diethylethanamine (1:1);3-Pyridinecarbonitrile, 5-(3-(5-cyano-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridinyl)-2-propenylidene)-1-ethyl-1,2,5,6-tetrahydro-4-methyl-2,6-dioxo-, compd. with N,N-diethylethanamine (1:1);5-(3-(5-Cyano-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridyl)allylidene)-1-ethyl-1,2,5,6-tetrahydro-4-methyl-2,6-dioxopyridine-3-carbonitrile, compound with triethylamine (1:1);5-[(1E,3Z)-3-(5-cyano-1-ethyl-4-methyl-2,6-dioxo-1,6-dihydropyridin-3(2H)-ylidene)prop-1-en-1-yl]-1-ethyl-6-hydroxy-4-methyl-2-oxo-1,2-dihydropyridine-3-carbonitrile - N,N-diethylethanamine (1:1);5-[(1E,3E)-3-(5-cyano-1-ethyl-4-methyl-2,6-dioxo-1,6-dihydropyridin-3(2H)-ylidene)prop-1-en-1-yl]-1-ethyl-6-hydroxy-4-methyl-2-oxo-1,2-dihydropyridine-3-carbonitrile - N,N-diethylethanamine (1:1)