Cypate is a near-infrared fluorescent dye that belongs to the family of photosensitizers. It is characterized by high photostability and optical properties, making it a common choice for near-infrared optical imaging, optical development, tumor labeling, and drug delivery applications. Moreover, Cypate serves as a molecular probe and binds with targeting molecules (such as CBT or small interfering RNA) to enable efficient detection and imaging of specific cells or tissues.