1. Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104 Freiburg im Breisgau, Germany
2. Peptide Chemistry Research Center, K. N. Toosi University of Technology, P.O. Box 15875-4416, Tehran 1541849611, Iran
3. Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
4. Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah 67149-67346, Iran