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Objective: Heat shock protein 90(Hsp90)is a therapeutic target for cancer treatment,and inhibition of Hsp90 will presumably result in suppression of multiple survival signaling pathways.Platycodin D(PD)is a saponin isolated from traditional Chinese medicine Platycodonis Radix with potent anti-cancer activity against a number of cancer.In this study,we intend to identify PD as a novel Hsp90 inhibitor.