(2E,4E)-3-Methyl-5-[(2S,3S)-3-methyl-3-(4-methyl-3-penten-1-yl)-2-oxiranyl]-2,4-pentadienoic Acid Methyl Ester is an intermediate in synthesizing Juvenile Hormone B 3 (J211205), a sesquiterpenoid produced by the larval ring gland and adult corpus allatum (CA) of Drosophila melanogaster. Juvenile hormones regulate development, reproduction, diapause, and polyphenisms.