Used as a reference standard in pharmaceutical analysis to support the development and quality control of palonosetron-based medications. It helps in identifying and quantifying metabolites during metabolic stability studies and bioanalytical assays. Commonly employed in HPLC and LC-MS methods to assess the degradation profile and metabolic pathways of palonosetron, ensuring drug safety and efficacy. Also useful in studying oxidative metabolism involving cytochrome P450 enzymes.