128767-21-5 2H-2-Pyrindine-4-carbonitrile, 3,5,6,7-tetrahydro-5-((dimethylamino)methylene)-3-oxo- 3,5,6,7-Tetrahydro-5-((dimethylamino)methylene)-3-oxo-2H-2-pyrindine-4-carbonitrile BRN 4187589