Rajitha, B., J. Vijayalakshmi, and M. Kanakalingeshwar Rao. 2010. “Synthesis of Mannich Base of 2, 3-Diphenyl 7(H) Oxofuro (3, 2-G) (I) Benzopyrones As Possible Biological Active Agents ”. Asian Journal of Chemistry 6 (3):589-91. https://asianpubs.org/index.php/ajchem/article/view/24610.