Quetiapine sulfone is primarily used in research and development settings as a metabolite of quetiapine, an antipsychotic medication. It plays a significant role in pharmacokinetic and pharmacodynamic studies to understand the metabolism and excretion pathways of quetiapine in the human body. Researchers utilize it to investigate the drug's efficacy, safety, and potential side effects, particularly in assessing how the body processes and eliminates the compound. Additionally, it is employed in analytical chemistry as a reference standard in high-performance liquid chromatography (HPLC) and mass spectrometry (MS) to detect and quantify quetiapine and its metabolites in biological samples. This aids in therapeutic drug monitoring and ensuring patient compliance with prescribed dosages.