1. Pharmacognosy Department , National Research Centre , Dokki 12311, Cairo , Egypt
2. Marine Chemistry Department , Faculty of Marine Sciences , King Abdulaziz University , Jeddah 21589 , Kingdom of Saudi Arabia
3. Phytochemistry and Plant Systematic Department , National Research Centre , Dokki 12311, Cairo , Egypt , Tel.: +966-5424-68093; Fax: +966-2640-1747
4. Chemistry Department , Faculty of Science , Jazan University , Jazan 2097 , Kingdom of Saudi Arabia
5. Phytochemistry and Plant Systematic Department , National Research Centre , Dokki 12311, Cairo , Egypt