1-(9Z-octadecenoyl)-2-(7Z,10Z,13Z,16Z,19Z-docosapentaenoyl)-sn-glycero-3-phospho-1D-myo-inositol + H2O = 2-(7Z,10Z,13Z,16Z,19Z-docosapentaenoyl)-sn-glycero-3-phospho-1D-myo-inositol + (9Z)-octadecenoate + H(+) — reaction