The present invention relates to a novel cyclic phosphopeptide compound having allosteric PLK1-PBD inhibitory activities. The compound of the present invention has PLK1-PBD inhibitory activities, and is useful as an antitumor agent. The present invention provides a cyclic phophopeptide compound represented by chemical formula 1, a hydrate thereof, a solvate thereof, an isomer thereof, or a racemic body and pharmaceutically acceptable salt thereof.
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