Hayouka, Z. ; Levin, A. ; Hurevich, M. ; Shalev, D. E. ; Loyter, A. ; Gilon, C. ; Friedler, A. . A Comparative Study Of Backbone Versus Side Chain Peptide Cyclization: Application For Hiv-1 Integrase Inhibitors. BIOORGANIC & MEDICINAL CHEMISTRY 2012, 20, 3317-3322.