Used as a labeling reagent in mass spectrometry for the identification and quantification of compounds. It is particularly valuable in proteomics and metabolomics studies, where it helps in tracking and analyzing complex biological samples. The deuterium atoms in the molecule provide a distinct mass signature, making it easier to differentiate labeled compounds from their unlabeled counterparts in analytical experiments. Additionally, it serves as a derivatization agent in organic synthesis, aiding in the preparation of deuterated analogs of various chemical compounds for research purposes. Its stability and specificity make it a preferred choice in isotopic labeling applications.