Quetiapine sulfoxide is primarily studied in the context of pharmaceutical research and development. It is a metabolite of quetiapine, an antipsychotic medication, and is often analyzed in pharmacokinetic studies to understand drug metabolism and excretion. Researchers investigate its presence in biological samples to assess patient adherence to quetiapine therapy and to monitor drug interactions. Additionally, it serves as a reference standard in analytical chemistry for developing and validating methods to detect and quantify quetiapine and its metabolites in clinical and forensic settings. Understanding its behavior helps in optimizing therapeutic efficacy and minimizing adverse effects.