1. Department of Pharmaceutical Chemistry Faculty of Pharmacv The Islamia University of Bahawalpur 63100 Pakistan
2. Department of Pharmaceutical Chemistry College of Pharmacy King Saud University P.O. Box 2457 Riyadh 11451 Saudi Arabia
3. Department of Biochemistry College of Science King Saud University P.O. Box 22452 Riyadh 11451 Saudi Arabia
4. Bahawalpur College of Pharmacy Bahawalpur Medical and Dental College Bahawalpur Pakistan
5. Department of Pharmacy Royal Institute of Medical Sciences (RIMS) Multan 60000 Pakistan
6. Department of Chemistry and Biochemistry Texas Tech University Lubbock TX 79409-1061 USA