FLUORESCENT LABEL AGENT FOR BIOIMAGING

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PROBLEM TO BE SOLVED : To provide a fluorescent label agent emitting near infrared light fluorescence with a wavelength region of 1000 nm to 1800 nm and containing no rare earth and to provide a method for realizing vivid and deep bioimaging by using the fluorescent label agent.SOLUTION : A fluorescent label agent for bioimaging is characterized by containing an organic compound emitting fluorescence with a wavelength of 1000 nm to 1800 nm, which is excited from irradiation light with a wavelength of 900 nm to 1000 nm, and by containing no rare earth element.