1. Department of Chemistry, Richardson College for the Environmental and Science Complex; The University of Winnipeg, 599 Portage Avenue; Winnipeg MB R3B 2G3 Canada
2. Chemistry of Natural and Microbial Products Department, Pharmaceutical and Drug Industries Research Division; National Research Centre, El-Buhouth St. 33, Dokki-Cairo 12622; Egypt
3. Chemistry of Natural Compounds Department, Division of Pharmaceutical Industries; National Research Centre; El-Behoosst. 33, Dokki-Cairo 12622 Egypt
4. Botany and Microbiology Department, Faculty of Science; Zagazig University