1. Photochemistry Department, Chemical Industries Research Division, National Research Centre, 33 El Buhouth Street, P.O. Box 12622, Cairo, Egypt
2. Pesticide Chemistry Department, Chemical Industries Research Institute, National Research Centre, 33 El Buhouth Street, P.O. Box 12622, Cairo, Egypt
3. Department of Tanning Materials and Leather Technology, National Research Centre, 33 El Buhouth Street, P.O. Box 12311, Cairo, Egypt