2-(4-Chlorophenyl)hexanenitrile-d9 is an intermediate used in the synthesis of Myclobutanil-d9 (M831402), which is the labeled analogue of Myclobutanil (M831400), which is an fungicide used on a wide range of food crops. Myclobutanil inhibits the biosynthesis of ergosterol, a critical componet of fungal cell membranes.