Used in targeted drug delivery systems due to its ability to bind to dopamine receptors overexpressed in certain cancer cells and neurological tissues. Enhances blood-brain barrier penetration, making it valuable in CNS-targeted therapies. The amine group allows conjugation with drugs, imaging agents, or nanoparticles. Commonly applied in neurodegenerative disease research, such as Parkinson’s and Alzheimer’s, for improved therapeutic delivery. Also utilized in bioconjugation and surface modification of medical devices to increase biocompatibility and reduce immune response. PEG spacer provides extended circulation time and stability in biological environments.