1,2-dilinoleoyl-sn-glycero-3-phospho-(1'-rac-glycerol) (sodium salt) is a sodium salt of glycerophospholipid, with substitution of two chains of linolenic acid at the sn-1 and sn-2 positions and phospho-(1'-rac-glycerol) at the sn-3 position of the glycerol backbone. It is used in saposin-derived lipid nanoparticles (SapNPs) formation to study the lipid specificity of saposins.