Used as a stable isotope-labeled internal standard in analytical chemistry, particularly in mass spectrometry, to enhance accuracy and precision in quantifying 1-aminopyrene in complex samples. It plays a critical role in environmental and biological studies, aiding in the detection and measurement of polycyclic aromatic hydrocarbons (PAHs) and their metabolites. Its deuterated structure ensures minimal interference with the target analyte, making it invaluable for research on PAH exposure, metabolism, and toxicity in both environmental and occupational health contexts.