(5S)-Methyloctadecane-d3 is the labelled version of (5S)-Methyloctadecane which can be utilized for biological study and biological activity of (R)- and (S)-14-methyl-1-octadecene, as the chiral component of the sex pheromone of the peach leafminer moth, Lyonetia clerkella Linne (Lepidoptera: Lyonetiidae)