Carboxyrhodamine 110-PEG3-Azide is widely used in bioimaging and bioconjugation due to its fluorescent properties and reactive azide group. It is commonly employed in labeling biomolecules such as proteins, peptides, and nucleic acids for tracking and visualization in cellular and molecular studies. The PEG3 spacer enhances solubility and reduces steric hindrance, improving the efficiency of conjugation reactions. Its azide group allows for click chemistry applications, enabling specific and stable attachment to alkyne-modified targets. This makes it valuable in drug delivery research, diagnostics, and the development of fluorescent probes for live-cell imaging.