JAISWAL, MEENAKSHI, et al. “QSAR Analysis of 5,6-Dihydro-4-Hydroxy-2-Pyrone Analogues: HIV-1 Protease Inhibitor”. Asian Journal of Chemistry, vol. 19, no. 5, Mar. 2010, pp. 4110-2, https://asianpubs.org/index.php/ajchem/article/view/13321.