Tacaciclib is a cyclin-dependent kinase (CDK) inhibitor with observed antineoplastic activity [1].

CDK9-Cyclin T1 PPI-IN-1 (Compound B19) is a selective inhibitor of the CDK9-Cyclin T1 protein-protein interaction (PPI), suppressing cell proliferation in TNBC MDA-MB-231 cells with an IC50 of 0.044 μM and inducing apoptosis. This compound diminishes CDK9 transcriptional activity and downregulates phosphorylation of RNA Pol II CTD ser2. In vivo, CDK9-Cyclin T1 PPI-IN-1 effectively impedes tumor growth in a TNBC 4T1 mouse model [1].

CDK8/19-IN-1 is a selective and oral bioavailable CDK8/19 dual inhibitor (IC50s: 0.46 nM, 0.99 nM, and 270 nM for CDK8, CDK19, and CDK9).

Palbociclib (PD 0332991) orotate, an orally active selective inhibitor of CDK4 and CDK6, exhibits IC50 values of 11 and 16 nM, respectively. This compound demonstrates potent anti-proliferative effects and induces cell cycle arrest in cancer cells, applicable in research concerning HR-positive, HER2-negative breast cancer, and hepatocellular carcinoma [1] [3] [4].

WAY-322243 has antibacterial and anti-inflammatory activity and has an inhibitory effect on CLK-1, which can be used to study Alzheimer's disease.