O-Methyl-D-tyrosine is primarily used in biochemical research and pharmaceutical development. It serves as a precursor in the synthesis of various biologically active compounds, particularly in the study of enzyme mechanisms and metabolic pathways. Its structural similarity to tyrosine makes it valuable for investigating tyrosine-related processes, such as protein synthesis and neurotransmitter production. Additionally, it is utilized in the development of radiopharmaceuticals for positron emission tomography (PET) imaging, aiding in the diagnosis and monitoring of neurological disorders and cancers. Its role in modulating enzyme activity also makes it a candidate for drug discovery targeting specific metabolic or signaling pathways.