Used as a coupling agent in bioconjugation chemistry, particularly in the immobilization of biomolecules on surfaces such as biosensors and microarrays. The aminooxy group selectively reacts with carbonyl groups (aldehydes or ketones) to form stable oxime bonds, enabling site-specific labeling and attachment of peptides, proteins, and carbohydrates. Commonly applied in diagnostic assays and drug development for creating stable bioconjugates under mild conditions. Also utilized in chemical biology research to probe glycosylation sites and modify glycans. Its bifunctional structure allows for spacer arm applications, improving accessibility and reducing steric hindrance in conjugated molecules.