1. Peptide Chemistry Research Institute, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran
2. Organisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 271, D-69120 Heidelberg, Germany
3. Department of Environmental Sciences, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, P.O. Box 46414-356, Noor, Iran