Synonyms: 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-(9CI); Glutaconimide,2-cyano-4-[3-(5-cyano-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridyl)allylidene]-N-ethyl-3-methyl-(8CI)