1. Peptide Chemistry Research CenterK. N. Toosi University of Technology, P. O. Box 15875–4416, Tehran Iran
2. Medical Biology Research CenterKermanshah University of Medical Sciences, Kermanshah Iran
3. Organisch-Chemisches Institut der Universitaet Heidelberg, Im Neuenheimer Feld 270 D-69120 Heidelberg Germany
4. Department of Environmental SciencesFaculty of Natural Resources and Marine SciencesTarbiat Modares University, Tehran Iran