(4-(1-(3-(CYANOMETHYL)-1-(ETHYLSULFONYL)AZETIDIN-3-YL)-1H-PYRAZOL-4-YL)-7H-PYRROLO(2,3-D)PYRIMIDIN-7-YL)METHYL PIVALATE
(4-(1-(3-(cyanomethyl)-1-(ethylsulfonyl)azetidin-3-yl)-1h-pyrazol-4-yl)-7h-pyrrolo(2,3-d)pyrimidin-7-yl)methyl pivalate