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 EB; Brinkman JA; Naderi GB; Burkey BF; Dunning BE; Prasad K; Mangold BL; Russell ME; Hughes TE (Journal of medicinal chemistry, 2003)