Used as a chemiluminescent reagent in analytical chemistry, particularly in immunoassays and nucleic acid detection. Its light-emitting properties upon oxidation make it ideal for sensitive detection in diagnostic tests, including automated clinical analyzers. Commonly employed in electrochemiluminescence (ECL) systems where it generates a strong, measurable signal in the presence of a suitable electrode and coreactant. Widely applied in pharmaceutical research and medical diagnostics due to high sensitivity, low background noise, and compatibility with multiplex assays.