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Coumarin compound is a kind of lactone compound in nature, which attracts many people by its diverse physiologically activities such as antibiosis, antiphlogosis, antitumor and so on. Moreover, coumarin compound can be used as optical bleaching agents,  laser dyes, fluorescent probes and two-photon fluorescent materials because of its excellent photochemical and photophysical properties. Furthermore, coumarin compound has unique performance in electroluminescent device and it has  been widely used in the field of medicine, food, dye, optical material and biomedicine.
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