Used in pharmaceutical research, especially in the development of central nervous system drugs. It has potential to improve pharmacokinetic properties of lead compounds, such as enhancing brain penetration, extending duration of action, and reducing side effects. Commonly used as a starting material or intermediate in the synthesis of brexpiprazole derivatives for structure-activity relationship (SAR) studies, especially in research for treatments of psychiatric disorders such as schizophrenia, depression, and bipolar disorder.