Purity >90%. Platelet-activating factor (PAF) is a biologically active phospholipid synthesized by a variety of stimulated cells that acts as a mediator of platelet aggregation, inflammation, and allergy. PAF is converted to the biologically inactive lyso-PAF by the enzyme PAF acetylhydrolase (PAF-AH). Recently, plasma PAF-AH has been linked to atherosclerosis and may be a positive risk factor for coronary heart disease in humans. 1-Linoleoyl glycerol (1-LG) is a fatty acid glycerol that has been isolated from S. chinensis roots. It inhibits PAF-AH with an IC50 of 45 μM. 1-LG has potential application in cholesterol lowering and antiatherogenic activity.