Baricitinib Impurity 1 Catalogue B410223 CAS 2402776-84-3 M.W 557.65 M.F C23H27N9O4S2 Specifications FAQs 2-(3-(4-(1-(3-(cyanomethyl)-1-(ethylsulfonyl)azetidin-3-yl)-1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)-1-(ethylsulfonyl)azetidin-3-yl)acetonitrile