1. Contribution from the Centro Interuniversitario per la Ricerca sui Peptidi Bioattivi (CIRPeB) & Department of Biological Chemistry,University of Naples “Federico II” Via Mezzocannone, 6 Naples, I-80134, Italy, Department of Chemistry, University of Naples “Federico II” Via Cynthia, Naples, I-80126, Italy, and Department of Chemistry IFM,University of Turin, Via Giuria, 7 Turin, I-10125, Italy