3-Methylphosphinicopropionic Acid-d3 Diethyl Ester is a derivative of 3-Methylphosphinicopropionic Acid-d3 Sodium Salt (M326162), a metabolite of Glufosinate (G596950). 3-Methylphosphinicopropionic Acid-d3 Diethyl Ester is used in the preparation of the naturally occurring amino acid, Phosphinothricin.