Strong platelet aggregation inhibitor. Binds specifically to platelet glycoprotein Ibalpha (GP1BA) with high affinity and inhibits vWF-dependent platelet aggregation (PubMed:7599152). Has also been observed to induce small agglutinates in washed platelets by binding to GPIb (PubMed:10688335). Tetramer of heterodimers of alpha and beta subunits (alphabeta)(4); disulfide-linked. Expressed by the venom gland. Has no effect on ADP- and collagen-induced platelet aggregation in platelet rich plasma. Belongs to the snaclec family.