3-((2-((2-Chloroethyl)amino)ethyl)amino)propyl Ethyl Phosphate Dihydrochloride-d4, a deuterium labelled3-((2-((2-Chloroethyl)amino)ethyl)amino)propyl Ethyl Phosphate Dihydrochloride (C984605),is a derivative ofCyclophosphamide Monohydrate (C988580), a known human carcinogen that is widely used in cancer chemotherapy because it can cross-link DNA causing strand breakage and mutation.