PF-4800567 is a casein kinase 1e (CK1e) selective inhibitor (IC50 = 32 nM) th at is 20 fold selective for the CK1e isoform over CK1d. PF-4800567 blockes CK1e-mediated PER3 nuclear translocation, but does not effect the circadian clock in animal studies.', 'PF-4800567 is also known as (3-[(3-Chlorophenoxy)methyl]-1-(tetrahydro-2H-pyran-4-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine hydrochloride). It can block the epidermal growth factor receptor (EGFR) at micromolar concentrations. PF-4800567 helps to improve the locomotor stimulant reaction to methamphetamine (MA) and fentanyl.