Anhydro Vinblastine-d3 Disulfate Salt is primarily utilized in research and development within the pharmaceutical and biochemical fields. Its main application is as a deuterated internal standard in mass spectrometry-based assays, particularly for the quantification of vinblastine and its metabolites in biological samples. This compound aids in enhancing the accuracy and precision of analytical measurements, ensuring reliable data in pharmacokinetic and metabolic studies. Additionally, it is employed in the investigation of drug interactions, metabolic pathways, and the stability of vinblastine-related compounds, contributing to the advancement of cancer research and therapeutic drug monitoring.