Baricitinib Impurity 3 Catalogue B410225 CAS 1187595-89-6 M.W 401.45 M.F C17H19N7O3S Specifications FAQs 2-(1-(ethylsulfonyl)-3-(4-(7-(hydroxymethyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)azetidin-3-yl)acetonitrile