1. Peptide Chemistry Research Institute K. N. Toosi University of Technology P. O. Box 15875–4416 15418–49611 Tehran Iran
2. Organisch-Chemisches Institut der Universitet Heidelberg Im Neuenheimer Feld 271 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