an N-(38-hydroxyoctatriacontenoyl)-sphing-4-enine + a (9Z,12Z)-octadecadienoyl-containing triacyl-sn-glycerol = an N-(38-(9Z,12Z-octadecadienoyloxy)-octatriacontenoyl)-sphing-4-enine + a diacylglycerol — reaction