(2E,4E)-2,4-Decadienoic Acid Ethyl Ester-d5 is an isotope analog of (2E,4E)-2,4-Decadienoic Acid Ethyl Ester. (2E,4E)-2,4-Decadienoic Acid Ethyl Ester is used in biological studies as characterization of key aroma compounds in Bartlett pear brandies.