Solid-phase synthesis was used to generate a focused RGD peptide mimet
ic library in an effort to identify potent and selective alpha(v) beta
(3) integrin antagonists. Increased activity was observed for compound
s possessing a urea linkage to piperazine, with the most active compou
nd (28) exhibiting an IC50 = 1.1 nM in an alpha(v) beta(3) ELISA assay
. (C) 1997 The DuPont Merck Pharmaceutical Company. Published by Elsev
ier Science Ltd.