1-[[(3-hydroxy-1-adamantyl)amino]acetyl]-2-cyano-(S)-pyrrolidine: a potent, selective, and orally bioavailable dipeptidyl peptidase IV inhibitor with antihyperglycemic properties. - Villhauer,E.B.; Brinkman,J.A.; Naderi,G.B.; Burkey,B.F.; Dunning,B.E.; Prasad,K.; Mangold,B.L.; Russell,M.E.; Hughes,T.E. (J Med Chem, 2003)