CGP-74514A hydrochloride is a potent CDK1 inhibitor with IC50 of 25 nM; induces caspase-9 activation and PARP degradation, mediates apoptosis in U937 cells.

Ibulocydine is the prodrug of CDK inhibitor BMK-Y101, inhibits CDK7 and CDK9 with IC50 of 530 nM and 85 nM in kinase assays, respectively.

TBB(NSC 231634) is a highly selective, ATP/GTP-competitive inhibitor of casein kinase-2 (CK2)with IC50s of 0.9 and 1.6 μM for rat liver and human recombinant CK2 respectively).