1. Fixed and Removable Prosthodontics Department, National Research Centre, 33 El Buhouth Street, Dokki, P.O.12622 Cairo, Egypt.
2. Refractories, Ceramics and Building Materials Department, National Research Centre, 33 El Buhouth Street, Dokki, P.O.12622, Cairo, Egypt.
3. Medicinal and Pharmaceutical Chemistry Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, 33 EL Bohouth st. (former EL Tahrir st.), Dokki, Giza, Egypt, P.O.12622, Affiliation ID: 10014618.
4. Chemistry of Natural Microbial Products Department, National Research Centre,33 El Buhouth Street, Dokki, P.O.12622, Cairo, Egypt.