1-Piperidinepropanoic acid, 4-methyl-3-(methyl-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-β-oxo-, ethyl ester, (3R,4R)- 2,4-DICHLORO-7H-PYRROLO2,3-DPYRIMIDINE (3R,4S)-1-benzyl-N,4-dimethylpiperidin-3-amine (3R,4R)-N,1,4-trimethyl-N-{7H-pyrrolo[2,3-d]pyrimidin-4-yl}piperidin-3-amine 1-Piperidinepropanenitrile, 4-Methyl-3-(Methyl-7H-pyrrolo[2,3-d]pyriMidin-4-ylaMino)-β-oxo- (3R,4R)-1-benzyl-N,4-dimethylpiperidin-3-amine dihydrochloride Tofacitinib Related Compound 36 CYANOACETIC ACID-OSU N-Hydroxysuccinimide Tofacitinib Impurity 2 N-Methyl-N-((3S,4S)-4-Methylpiperidin-3-yl)-7H-pyrrolo[2,3-d]pyriMidin-4-aMine Tofacitinib Related Compound 3-Piperidinamine,4-methyl-1-(phenylmethyl)-,(3R,4R)-rel- methyl3-((3R,4R)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin -4-yl)amino)piperidin-1-yl)-3-oxopropanoate N-((3R,4R)-1-benzyl-4-methylpiperidin-3-yl)-N-methyl-7H-pyrrolo[2,3-d]pyrimidin-4-amine 3-((3S,4S)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)-3-oxopropanenitrile Tofacitinib Related Compound 42 Tofacitinib Related Compound 39