Binds to the platelet GPIb/IX/V receptor system and inhibits ristocetin-induced platelet aggregation in human platelet-rich plasma. Strongly inhibits platelet aggregation induced by ADP, calcium ionophore, thrombin and collagen. Does not inhibit U46619-induced platelet aggregation. Heterodimer of subunits alpha and beta; disulfide-linked. Expressed by the venom gland. Glycosylated. Belongs to the snaclec family.