1-(4-Chlorophenyl)-2-(Ethylamino)-1-Propanone-(d5) is a labelled form of 4'-Chloro-2-(ethylamino)propiophenone-(d5) (CAS14919-85-8) which is a derivative of propiophenone (P827900). Propiophenone is used in the preparation of pharmaceutical and organic compounds, perfumes, and in the preparation of neurochemical compounds such as ephedrines.