A cuticular pheromone in female fruit flies that stimulates male courtship behavior; biosynthesis appears to be mediated by an elongase with female-biased expression.

An unsaturated cuticular hydrocarbon that acts as a contact sex pheromone in Drosophila; may stimulate copulation either by itself at high concentrations or when combined with other alkenes; increases in Drosophila females immediately after copulation.

An unsaturated cuticular hydrocarbon that acts as a pheromone in some insects, including Drosophila; abundant only in males of D. melanogaster and D. sechellia; prevents or reduces male courtship behavior and increases female sexual receptivity.

A 25-C diene that is found in low abundance on cuticles of mature Drosophila females; depletion of a female-specific elongase (eloF), which leads to an increase in 7(Z),11(Z)-pentacosadiene along with a parallel decrease in 7,11-nonacosadiene, significantly reduces copulation in Drosophila.

Used as a standard for the analysis of fatty acids, when the fatty acids have been transesterified to methyl esters before analysis.