Azido-PEG-sulfonic acid is a versatile compound that has found broad applications in pharmaceutical research and development. It is a functionalized polyethylene glycol (PEG) molecule that contains azide and sulfonic acid groups, making it a powerful tool for conjugation chemistry. The azide group is a reactive functional group that can be used for bioconjugation reactions, while the sulfonic acid group imparts solubility and stability to the molecule. Azido-PEG-sulfonic acid can be used to modify biomolecules such as peptides, proteins, and nucleic acids to improve their pharmacokinetic properties or to create targeted drug delivery systems. Its unique functionalization has made it an essential reagent in the field of drug discovery and development.