Formation of furo[3,2-c]quinolone-2-carbonitriles and 4-oxo-4,5-dihydrofuro[3,2-c]quinolone-2-carboxamides from reaction of quinoline-2,4-diones with 2-[bis(methylthio)methylene]malononitrile. - Aly, Ashraf A.; Ishak, Esam A.; Shwaky, Ahmed M.; Mohamed, Asmaa H. (Chemical Monthly / Monatshefte für Chemie, 2020)