4-[(6-Bromohexyl)oxy]benzonitrile is an intermediate in the synthesis of Ethyl 4-[[6-(4-Carbamimidoylphenoxy)hexyl]oxy]benzimidoate (E900958), which is an impurity of Hexamidine Diisetionate (H294205), which is an amidine compound used in the treatment of amyloid-related diseases. It is also used as preservative in cosmetics as an antiseptic.