AZD0364 exhibits high cellular potency against a direct downstream substrate on the MAPK pathway (e.g. inhibition of phospho-p90RSK1 in BRAFV600E mutant A375 cells, IC50 = 6 nM). The molecule is a highly selective kinase inhibitor (10/329 kinases tested are inhibited at >50% at a 1 µM) and has long residence time on the protein (as determined by SPR on human unphosphorylated-ERK2: pKd = 10; t1/2 = 277 mins).