This compound is widely used in bioconjugation and labeling applications due to its dual functionality. The azide group allows for click chemistry reactions, particularly with alkyne-containing molecules, enabling precise and efficient conjugation. The m-PEG4 moiety enhances solubility and biocompatibility, making it suitable for in vivo and in vitro studies. The Cy7 fluorophore is ideal for near-infrared (NIR) imaging, providing deep tissue penetration and low background fluorescence. It is commonly employed in molecular imaging, cellular tracking, and drug delivery systems. Additionally, its PEGylated structure reduces immunogenicity and prolongs circulation time in biological systems. This makes it a valuable tool for developing targeted therapies and diagnostic agents.