Diethyl (2-Amino-3-Cyano-4H-Chromen-4-yl)Phosphonate and Its Halogenated Derivatives as Effective Drug: A Theoretical and an Experimental Spectroscopic Study. - Yadav, Krishna Kant; Kumar, Abhishek; Kumar, Amarendra; Brahmachari, Goutam; Misra, Neeraj (Polycyclic Aromatic Compounds, 2022)