1-stearoyl-2-linoleoyl-sn-glycero-3-phospho-(1'-rac-glycerol) (sodium salt) is a sodium salt of glycerophospholipid, with substitution of stearic acid, linolenic acid and phospho-rac-(1-glycerol) at the sn-1, sn-2 and sn-3 positions respectively, in the glycerol backbone. It is used as a lipid standard for phosphoglycerol lipid in liquid chromatography mass spectrometry (LC-MS) analysis.