ighly active and selective anticoagulants: D-Phe-Pro-Arg-H, a free tripeptide aldehyde prone to spontaneous inactivation, and its stable N-methyl derivative, D-MePhe- Pro-Arg-H - Bajusz, S; Szell, E; Bagdy, D; Barabas, E; Horvath, E; Dioszegi, M; Fittler, Z; Szabo, G; Juhasz, A; Tomori, E; Szilagyi, G (J Med Chem, 1990)