Inhibits fibrinogen interaction with platelets. Acts by binding to alpha-IIb/beta-3 (ITGA2B/ITGB3) on the platelet surface and inhibits ADP-induced platelet aggregation in human platelet-rich plasma. Heterodimer with subunit beta; disulfide-linked. Expressed by the venom gland. Belongs to the disintegrin family. Dimeric disintegrin subfamily.