New prolyl endopeptidase inhibitors: in vitro and in vivo activities of azabicyclo[2.2.2]octane, azabicyclo[2.2.1]heptane, and perhydroin-dole derivatives - Portevin, B; Benoist, A; Rémond, G; Hervé, Y; Vincent, M; Lepagnol, J; De Nanteuil, G (J Med Chem, 1996)