Used primarily in research and development, this compound serves as a labeled internal standard in analytical chemistry. It aids in the precise quantification and identification of dapoxetine and its metabolites in biological samples through techniques like mass spectrometry. This is crucial for pharmacokinetic studies, ensuring accurate measurement of drug concentrations in plasma or urine. Additionally, it supports the development of bioanalytical methods, contributing to the understanding of drug metabolism and distribution in clinical trials. Its labeled structure allows for differentiation from the unlabeled compound, enhancing the reliability of experimental data.