A member of the class of 1-thio-sn-glycero-3-phosphocholines that is (2S)-2-amino-3-sulfanylpropyl 2-(trimethylazaniumyl)ethyl phosphate in which the amino group is substituted by a palmitoyl group and the thiol is substituted by a palmityl group. It is a reversible inhibitor of secretory phospholipase A2.