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Deubiquitinating enzymes (DUBs) are key regulatory components of the ubiquitination system. Many DUBs have been revealed to play key roles in normal physiology and diseases. However, only very limited DUB members have well-characterized inhibitors. OTUB1 and USP8 are two DUBs reported to promote both immune evasion and tumorigenesis in tumor models, yet their targeted inhibitors are in the early stages of development. Here, we describe the lead identification and optimization of an OTUB1/USP8 dual inhibitor, 61, which exhibits highly pot