英文别名Propanoic acid, 2,2-dimethyl-, [4-[1-[3-(cyanomethyl)-1-(ethylsulfonyl)-3-azetidinyl]-1H-pyrazol-4-yl]-7H-pyrrolo[2,3-d]pyrimidin-7-yl]methyl ester; (4-(1-[3-(Cyanomethyl)-1-(ethanesulfonyl)azetidin-3-yl]-1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)methyl 2,2-dimethylpropanoate; Baricitinib Impurity 63; Baricitinib Impurity 44 
