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(+) Heterodimer of an alpha and a beta chain; probably disulfide-linked. Expressed by the venom duct. The measured mass is of a heterodimer of an alpha and a beta chain. Belongs to the phospholipase A2 family. Group IX subfamily.