1-(9Z-octadecenoyl)-2-(8Z,11Z,14Z-eicosatrienoyl)-sn-glycero-3-phospho-1D-myo-inositol + H2O = 2-(8Z,11Z,14Z-eicosatrienoyl)-sn-glycero-3-phospho-1D-myo-inositol + (9Z)-octadecenoate + H(+) — reaction