[5-Chloro-2-(hexadecylthio)phenyl]-hydrazine is derived from 2-Amino-4-chlorobenzenethiol (A604340), which is used as reagent in the synthesis of several organic compounds including that of MHY908 which is an inhibitor of melanogenesis and can potentially be used in the prevention and treatment of pigmentation disorders. Also used in the synthesis of γ-lactam analogs of prostaglandin E2 which may act as EP4 agonists.