(S)-O-Desmethylraclopride is primarily used in neuroscience research as a selective dopamine D2 receptor antagonist. It is particularly valuable in positron emission tomography (PET) imaging studies to investigate the distribution and function of D2 receptors in the brain. This compound helps in understanding neurological disorders such as Parkinson's disease, schizophrenia, and addiction, as it provides insights into dopamine-related pathways. Additionally, it aids in the development of therapeutic strategies targeting dopamine receptors by allowing researchers to visualize and quantify receptor binding in vivo. Its high specificity makes it a crucial tool for studying the role of dopamine in both normal and pathological brain function.