CHIR 99021. A GSK-3beta inhibitor, Synonyms: 6-((2-((4-(2,4-Dichlorophenyl)-5-(4-methyl-1H-imidazol-2-yl)pyrimidin-2-yl)amino)ethyl)amino)nicotinonitrile; CT99021, CAS Number: 252917-06-9, Purity: G95% by High-performance liquid chromatography, Molecular Formula: C22H18Cl2N8, 5mg.