Iodo-PEG-Iodide is a versatile compound used in the field of pharmaceutical research and development. It is a bifunctional molecule that contains two iodide groups connected by a polyethylene glycol (PEG) linker. The PEG linker provides solubility in aqueous solutions and prevents aggregation, while the iodide groups serve as reactive functional groups for further modification or labeling. This compound is often used in the synthesis of radiolabeled compounds, which are valuable tools in drug discovery and development. Radiolabeled compounds allow for the tracking of drugs in vivo, as well as the evaluation of pharmacokinetic and pharmacodynamic properties.