Design, synthesis, and modeling of novel cyclic thrombin receptor-derived peptide analogues of the Ser42-Phe-Leu-Leu-Arg46 motif sequence with fixed conformations of pharmacophoric groups: Importance of a Phe/Arg/NH2 cluster for receptor activa - Alexopoulos, K.; Panagiotopoulos, D.; Mavromoustakos, T.; Fatseas, P.; Paredes-Carbajal, M.C.; Mascher, D.; Mihailescu, S.; Matsoukas, J. (Journal of Medicinal Chemistry, 2001)