1. Chemistry of Natural Compounds Department, Division of Pharmaceutical Industries, National Research Centre, Dokki-Cairo, Egypt
2. University of Göttingen, Institute of Organic and Biomolecular Chemistry, Göttingen, Germany
3. Faculty of Science, Botany and Microbiology Department, Damanhour University, Damanhour, Egypt
4. Faculty of Science, Botany Department, Mansoura University, El-Mansoura, Egypt