3 - ((3R, 4R) -4-Methyl-3- [methyl- (7H-pyrrolo [2,3-d] pyrimidin-4-yl) -amino] piperidinyl) -3-oxo-propionitrile as inhibitor protein kinase

The compound 3-{(3R,4R)-4-methyl-3-[methyl-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-amino]-piperidin-1-yl}-3-oxo-propionitrile or a pharmaceutically acceptable salt thereof; compositions containing the compound; and uses of the compound in the manufacture of medicaments.