Mohammed, F.K., A.I. Essawy, and M.G. Badrey. “Facile and Convenient Synthesis of Novel Benzopyranopyrimidine Derivatives”. Asian Journal of Chemistry 21, no. 8 (March 30, 2010): 5873–5887. Accessed July 23, 2024. https://asianpubs.org/index.php/ajchem/article/view/12261.