Coumarin Derivative

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A novel coumarin derivative having a specific structure; and a method for preparing the coumarin derivative which comprise a step of reacting a phenol compound having a specific atomic group with a naphtylamine compound having a specific atomic group. The coumarin derivative is a novel organic compound having a maximum absorption in the visible radiation region and thus contributes the extension of the range of phtosensitizers which can be selected in the preparation of a photopolymerizable composition.