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生物活性：Zotiraciclib hydrochloride是一种小分子多靶点酶抑制剂，具有抑制肿瘤生长的活性。Zotiraciclib hydrochloride通过抑制周期蛋白依赖性激酶9（CDK9）来降低Myc的水平，从而发挥其抗肿瘤效果。Zotiraciclib hydrochloride可能对穿越血脑屏障的癌症抑制有用。Zotiraciclib hydrochloride的MCL-1高蛋白水平与生存期相关，提示其在进一步的研究中可能作为预后因素和抑制靶点。

Zotiraciclib hydrochloride is a novel small molecule multi-target enzyme inhibitor with activity in inhibiting tumor growth. Zotiraciclib hydrochloride exerts its anti-tumor effect by reducing the level of Myc through inhibiting cyclin-dependent kinase 9 (CDK9). Zotiraciclib hydrochloride may be useful for inhibiting cancers that cross the blood-brain barrier. The high protein level of MCL-1 of Zotiraciclib hydrochloride is associated with survival, suggesting that it may serve as a prognostic factor and inhibitory target in further studies^[1].