1-octadecanoyl-2-hexadecanoyl-sn-glycero-3-phosphocholine + H2O = 2-hexadecanoyl-sn-glycero-3-phosphocholine + octadecanoate + H(+)
1-octadecanoyl-2-hexadecanoyl-sn-glycero-3-phosphocholine + h2o = 2-hexadecanoyl-sn-glycero-3-phosphocholine + octadecanoate + h(+)