(6E)-8-Methyl-6-nonenoic Acid Methyl Ester-d3 is the isotope labelled analog of (6E)-8-Methyl-6-nonenoic Acid Methyl Ester (M328240); the methyl ester derivative of 6E)-8-Methyl-6-nonenoic Acid (M325790) which is a compound used in the synthesis of Capsaicin analogs useful for their anti-tumor activity.