Institution: | a Department of Chemistry, University of Massachusetts, Amherst MA 01003, USA b Protein Research Department, Genetic Engineering Institute, Mubarak City for Scientific Research, Borg El-Arab, Alexandria 21934, Egypt c Department of Chemistry, Faculty of Science, Alexandria University, Alexandria 21321, Egypt d Peptide Chemistry Department, National Research Center, El-Tahrir St., Dokki, Cairo 12622, Egypt |