1. Department of Chemistry, University of Alberta, Edmonton, AB T6G 2G2, Canada
2. Department of Oncology, University of Alberta─Cross Cancer Institute, Edmonton, AB T6G IZ2, Canada
3. Cancer Research Institute of Northern Alberta, University of Alberta, 2-132 Li Ka Shing, Edmonton, AB T6G 2E1, Canada
4. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Ain Shams University, Abassia, P.O. Box 11566, Cairo 11566, Egypt