DOX-PEG-Cy3 (Doxorubicin-PEG-Cy3) is a Cy3-labeled DOX-PEG conjugate. The Cy3 fluorophore is commonly used for applications such as immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry. The maximum emission wavelength of Cy3 is approximately 562-570 nm. DOX is a broad-spectrum anthracycline antibiotic with cytotoxic properties.