1. Organic Chemistry Department, Faculty of Pharmacy, Helwan University, Cairo, Egypt
2. Photochemistry Department, National Research Centre, Dokki, Cairo, Egypt.
3. Pharmacology Department, Faculty of Pharmacy, Helwan University, Cairo, Egypt
4. Organic Chemistry Department, Faculty of Pharmacy, Helwan University, Cairo, Egypt b Photochemistry Department, National Research Centre, Dokki, Cairo, Egypt