cis-9,10-Epoxystearic Acid Methyl Ester-d3 is labelled cis-9,10-Epoxystearic Acid Methyl Ester (E589890) which can be used as an inhibitor of soybean lipoxygenase. It is also an intermediate used to synthesize biobased polyurethane from oleic and ricinoleic acids as renewable resources.