1. Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology Tianjin University 92 Weijin Road Nankai District Tianjin 300072 P.R. China
2. Department of Chemistry Texas A&M University 3255, TAMU College Station TX 77840 USA
3. National Research Centre Chemical Industries Research Division, Department of Photochemistry 33 El Buhouth Street, P.O. Box 12622 Giza Egypt