Inhibits fibrinogen interaction with platelets. Acts by binding to the glycoprotein IIb-IIIa receptor (ITGA2B/ITGB3) on the platelet surface and inhibits aggregation induced by ADP, thrombin, platelet-activating factor and collagen. Also inhibits T24 and SK-Mel-28 cell adhesion to fibronectin with IC(50) of 4.4 uM and 33 nM, respectively.