riviciclib (P276-00 free base) 是一种有效的CDK抑制剂,能够抑制多种CDK-cyclin复合体,其IC50值分别为:CDK9-cyclin T1(20 nM),CDK4-cyclin D1(63 nM),CDK1-cyclin B(79 nM),CDK2-cyclin A(224 nM),CDK2-cyclin E(2500 nM),CDK6-cyclin D3(396 nM) 和 CDK9-cyclin H(2900 nM)。研究显示,riviciclib 对顺铂耐药的细胞具有抗肿瘤活性。