Used as a labeled internal standard in mass spectrometry and analytical chemistry for the detection and quantification of nitroaniline derivatives in environmental and biological samples. Its deuterated structure allows for accurate differentiation from non-labeled compounds during chromatographic analysis. Commonly applied in studies involving pesticide degradation, metabolite tracing, and contamination monitoring due to its stability and distinct mass signature. Also utilized in research settings to investigate reaction mechanisms and pathways where isotopic labeling helps track molecular transformations.