2-Quinoxalinecarboxylic acid-d4（Cat No.:I043639）is a deuterated derivative of 2-quinoxalinecarboxylic acid, where four hydrogen atoms are replaced by deuterium (d4) to provide stable isotope labeling. This compound is used in analytical chemistry, particularly in mass spectrometry, for studying the metabolism, pharmacokinetics, and bioavailability of quinoxaline derivatives. The deuterium labeling enhances sensitivity and allows for precise tracking of the compound in complex biological matrices. It is commonly employed in research related to drug development, especially in studies investigating quinoxaline-based compounds for their potential as antimicrobial, anticancer, or neuroprotective agents.