rac-1-Palmitoyl-3-oleoyl-2-chloropropanediol-d5 is the labeled analogue of rac-1-Palmitoyl-3-oleoyl-2-chloropropanediol (P160510), which is used to detect 2-monochloropropanediol esters in edible oils through liquid chromatography-tandem mass spectrometry.