Used as a deuterated internal standard in mass spectrometry and NMR spectroscopy for accurate quantification and structural analysis. Its fully deuterated methyl groups enhance detection sensitivity and reduce background interference in complex mixtures. Commonly applied in metabolic studies and reaction mechanism tracing where isotopic labeling is required. Stable under typical analytical conditions, making it suitable for long-term experiments. Also employed in kinetic isotope effect studies due to altered vibrational frequencies from deuterium substitution.