Used as a deuterated solvent in nuclear magnetic resonance (NMR) spectroscopy, enabling clearer analysis of proton signals by eliminating interference from solvent protons. Its deuterium atoms do not produce signals in the typical proton NMR range, making it ideal for studying molecular structure and dynamics in organic and organometallic compounds. Also employed as a stable isotope-labeled reagent in mass spectrometry and metabolic studies to track reaction pathways and degradation processes. Commonly chosen for high-precision analytical work due to its excellent solvating properties and compatibility with a wide range of compounds.