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生物活性：CDK12/13-IN-3 (Compound 12b) 是口服有效的 CDK 抑制剂，可抑制 CDK12 和 CDK13，IC₅₀ 分别为 107.4 nM 和 79.4 nM。CDK12/13-IN-3 抑制 RNA 聚合酶 II CTD 上 Ser2 的磷酸化，诱导 DNA 损伤，并下调 DNA 损伤反应 (DDR) 的基因表达。CDK12/13-IN-3 对多种癌细胞表现出抗增殖活性，IC₅₀ 为纳摩尔水平。CDK12/13-IN-3 在小鼠模型中表现出抗肿瘤作用，表现出良好的药代动力学特性，口服生物利用度为 53.6%^[1]。

CDK12/13-IN-3 (Compound 12b) is the orally active inhibitor for CDK that inhibits CDK12 and CDK13 with IC₅₀ of 107.4 nM and 79.4 nM. CDK12/13-IN-3 inhibits the phosphorylation of Ser2 on the CTD of RNA polymerase II, induces DNA damage, and downregulates the gene expression of DNA damage response (DDR). CDK12/13-IN-3 exhibits antiproliferative activity against multiple cancer cells with IC₅₀ of nanomolar levels. CDK12/13-IN-3 exhibits antitumor effect in mouse models, exhibits good pharmacokinetic properties with an oral bioavailability of 53.6%^[1].