Snake venom phospholipase A2 (PLA2) that acts in vivo as an anti-thrombotic agent. Inhibits platelet aggregation induced by ADP, arachidonic acid, and thrombin. PLA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 1-acyl-sn-glycero-3-phosphocholine + a fatty acid + H(+) Binds 1 Ca(2+) ion. Monomer. Expressed by the venom gland. The venom of this snake has been orally administered to patients in China for about 2000 years, mostly to treat thrombotic diseases. Belongs to the phospholipase A2 family. Group II subfamily. D49 sub-subfamily.