1. Department of Chemistry, Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia
2. Department of Pharmaceutical Sciences, College of Pharmacy Shaqra University Al Dwadmi 11961 Saudi Arabia
3. Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy South Valley University Qena 83523 Egypt
4. Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy Al-Azhar University Assiut 71524 Egypt
5. Research School of Chemistry Australian National University Canberra, ACT 2601 Australia
6. Department of Organic and Medicinal Chemistry, Faculty of Pharmacy University of Sadat City Menoufiya 32897 Egypt
7. Department of Pharmaceutical Chemistry, Faculty of Pharmacy Al-Azhar University Assiut 71524 Egypt
8. National Center for Natural Products Research, School of Pharmacy Mississippi University Mississippi MS 38677 USA