Used primarily as a labeled internal standard in analytical chemistry, especially in mass spectrometry and liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods. Its deuterated methyl group allows for accurate quantification of N-Nitroso compounds in complex biological matrices by distinguishing the analyte signal from background noise. It is particularly valuable in metabolic studies and toxicological screening where precise measurement of nitrosamine impurities or their metabolites is required. Due to its structural similarity to non-deuterated analogs, it closely mimics the behavior of the target compound during sample preparation and analysis, ensuring high analytical accuracy and reliability.