The present invention provides an amino pyrazole compound, which is 3-[(1R)-6-fluoro-2,3-dihydro-1H-inden-1-yl]-N-(3-methyl-IH-pyrazol-5-yl)-3H-imidazo[4,5-b]pyridin-5-amine, or a pharmaceutically acceptable salt thereof, that inhibits JAK1 and JAK2 and, therefore may be useful in treating cancer.