PUN51207 (also known as CK1-IN-1) is a novel and potent casein kinase 1 (CK1) inhibitor extracted from patent WO2015119579A1.

PF-4800567 (PF4800567) is a novel, potent and selective inhibitor of casein kinase 1ϵ (CK1ϵ) with potential utility in treating circadian disorders.

D 4476 (D-4476; D4476; Casein Kinase I Inhibitor) is a potent, selective, and cell-permeant inhibitor of CK1 (casein kinase 1) with potential antitumor activity.

SR-3029 is a novel, potent, highly kinase selective and ATP competitive CK1δ and CK1ε (casein kinase 1δ/1ε) inhibitor with IC50s of 44 nM and 260 nM, respectively, and Kis of 97 nM for both kinases.

TBB (NSC 231634; Casein Kinase II Inhibitor I) is a novel, potent, cell-permeable and ATP-competitive inhibitor of protein kinase CK2 with an IC50 of 0.15 μM for rat liver CK2.

PF-670462 (also known as PF670462; PF670) is a novel, potent and selective inhibitor of casein kinase (CK1ε and CK1δ) with anticancer activity.

Hematein (Haematein) is a oxidized analogue of Hematoxylin used as a dye.

Emodin (HSDB-7093; NSC-408120; NSC-622947; Emodol; Frangula emodin), a naturally occuring anthraquinone analog found in rubarb, buckthorn, and Japanese knotweed, is a potent and broad-spectrum anticancer agent that also has anti-inflammatory and neuroprotective effects.

TTP 22 is a novel, selective and potent inhibitor of human protein kinase CK2 with an IC50 of 100 nM and a Ki of 40 nM.

Silmitasertib (also know as CX-4945) is a selective and orally bioavailable small-molecule inhibitor of CK2 (casein kinase 2) with IC50 of 1 nM in a cell-free assay, it is less potent to Flt3, Pim1 and CDK1 (inactive in cell-based assay).