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This lead compound was identified as a selective USP5 inhibitor by targeting the ubiquitin-associated domain 2 (UBA2) region. It also induced aggregation and precipitation of the target protein, which led to USP5 dysfunction. WCY-8-67 exhibited excellent in vivo bioavailability and tolerability, and it effectively inhibited the growth of AML cells in animal models. In addition, in a patient-derived xenograft (PDX) model, this compound, when combined with 5-azacytidine (5-Aza), improved therapeutic effects. 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