This invention relates to the compound (2R)-2-(6-{5-chloro-2-[(oxan-4-yl)amino]pyrimidin-4-yl}-1-oxo-2,3-dihydro-1H-isoindol-2-yl)-N-[(1S)-1-(3-fluoro-5-methoxyphenyl)-2-hydroxyethyl]propanamide, and in particular to novel physical forms of the compound, a process for preparing the compound and synthetic intermediates for use in the process, and novel formulations containing the compound, as well as therapeutic uses of the compound.