Deuterated dichloromethane (CD2Cl2 or C2H2Cl2) is a form (isotopologue) of dichloromethane (DCM, CH2Cl2) in which the hydrogen atoms (H) are deuterium (heavy hydrogen) (2H or D). Deuterated DCM is not a common solvent used in NMR spectroscopy as it is expensive compared to deuterated chloroform.