El-Shaaer, Hafez Mohamed, Salah Sayed Ibrahim, Wafaa Ramzy Abd-Elmonem, and Christine Gamal Ibrahim. 2012. “An Efficient Cyclocondensation Reactions, Antimicrobial Activity and Molecular Orbital Calculations of α-Benzopyrone Derivatives”. European Journal of Chemistry 3 (2):172-78. https://doi.org/10.5155/eurjchem.3.2.172-178.582.