Glucose-PEG-Cy3 is a Cy3-labeled Glucose-PEG conjugate. The Cy3 fluorophore is commonly applied in immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry. The maximum emission wavelength of Cy3 is approximately 562-570 nm. Glucose-PEG enhances cellular uptake of drugs and reduces endosomal degradation, making it useful for drug delivery.