Conformationally rigid N-acyl-5-alkyl-L-prolyl-pyrrolidines as prolyl oligopeptidase inhibitors - Wallén, E A; Christiaans, J A; Saarinen, T J; Jarho, E M; Forsberg, M M; Venäläinen, J I; Männistö, P T; Gynther, J (Bioorg Med Chem, 2003)