Deuterated ethanol (C2D5OD)  is a form (called an isotopologue) of ethanol (C2H5OH) in which the hydrogen atom ("H") is replaced with deuterium (heavy hydrogen) isotope ("D").
Deuterated ethanol (C2D5OD) is a variant of ethanol (C2H5OH), specifically one in which hydrogen atoms are replaced by deuterium isotopes, resulting in an isotopologue with distinct chemical properties.