1-Stearoyl-2-linoleoyl-sn-glycerol-d5 is labelled 1-Stearoyl-2-linoleoyl-sn-glycerol (S686490) which is used in the study of the influence of platelet-derived growth factor (PDGF) on diacylglycerol phosphorylation in Swiss 3T3 cells. It is also a possible protein kinase C activator.