1. Department of Chemistry; Quaid-i-Azam University; Islamabad 45320 Pakistan
2. Department of Chemistry; University of Science and Technology; Bannu 28100 KPK Pakistan
3. College of Pharmacy; University of Hawaii at Hilo; 34 Rainbow Drive Hilo HI 96720 USA
4. Arnold & Marie Schwartz College of Pharmacy; Long Island University; Brooklyn NY 11201 USA
5. Département de Chimie; Université de Montréal; Montreal Canada