“…Coumarins are derivatives of 2H-1-benzopyran-2-one, which naturally occurs in plants as free coumarins or their glycoside derivatives (Kashman et al, 1992;Currens et al, 1996;McKee et al, 1998;Creagh et al, 2001;Shokoohinia et al, 2018;Bhatia and Rawal, 2019;Kawai et al, 2019;Li et al, 2019;Lin et al, 2019;Makowska et al, 2019;Ramdani et al, 2019;Selvaraj et al, 2019;Wang et al, 2019;Zhang and Xu, 2019). Coumarins have been known for their proapoptotic anticancer activity with inhibitory effects on tumor-promoting signal transduction pathways as well as antiviral activity (Kashman et al, 1992;Currens et al, 1996;McKee et al, 1998;Creagh et al, 2001;Shokoohinia et al, 2018;Bhatia and Rawal, 2019;Kawai et al, 2019;Li et al, 2019;Lin et al, 2019;Makowska et al, 2019;Ramdani et al, 2019;Selvaraj et al, 2019;Wang et al, 2019;Zhang and Xu, 2019). The naturally occurring coumarin derivatives, (+)-calanolide A and (-)-calanolide B, have been identified as inhibitors of non-nucleoside HIV-1-specific reverse-transcriptase inhibitory activity (Kashman et al, 1992;Currens et al, 1996;Creagh et al, 2001).…”