Aminooxy-PEG3-C2-thiol is widely used in bioconjugation and surface modification applications. Its aminooxy group enables efficient conjugation with aldehydes or ketones, making it valuable for linking biomolecules such as proteins, peptides, or antibodies. The thiol group allows for attachment to gold surfaces or other thiol-reactive substrates, facilitating the creation of functionalized surfaces for biosensors or biochips. The PEG spacer enhances solubility and reduces steric hindrance, improving the efficiency of conjugation processes. This compound is particularly useful in drug delivery systems, where it can be employed to create targeted therapeutics by attaching drugs to specific biomolecules. Additionally, it plays a role in the development of diagnostic tools, enabling the immobilization of biomolecules on surfaces for detection purposes. Its dual functionality makes it a versatile reagent in biotechnological and pharmaceutical research.