1. Chemistry Department, Faculty of Science, Ain Shams University, El-Khalifa El-Mamoun, 11566 Abbassia, Cairo, Egypt
2. Medicinal Chemistry Department, Theodor Bilharz Research Institute, Kornaish El-Nile, 12411 Warrak El-Hadar, Imbaba (P.O. 30), Giza, Egypt
3. Microbial Chemistry Department, Genetic Engineering and Biotechnology Division, National Research Centre, El Behoos Street 33, Dokki-Giza 12622, Egypt