Tofacitinib Impurity 19 Tofacitinib impurity T Methyl (4-Methylpiperidin-3-yl)carbaMate 4-CHLORO-7-TOSYL-7H-PYRROLO[2,3-D]PYRIMIDINE BENZYL ETHYL ETHER 4-chloro-6,7-dihydro-5H-pyrrolo[2,3-d]pyrimidine N-methyl-N-((3R,4R)-4-methylpiperidin-3-yl)-7H-pyrrolo[2,3-d]pyrimidin-4-amine Tofacitinib Impurity 85 N-((3R,4S)-1-benzyl-4-methylpiperidin-3-yl)-N-methyl-7H-pyrrolo[2,3-d]pyrimidin-4-amine 4-Amino-2,6-dichloropyrimidine Malonyl chloride Benzyl chloride 6-AMINO-5(2,2-DIETHOXYETHYL)-4-HYDROXY-2-MERCAPTOPYRIMIDINE CYANOACETIC ACID-OSU N-Hydroxysuccinimide Tofacitinib Impurity 29 N-Methyl-N-((3S,4S)-4-Methylpiperidin-3-yl)-7H-pyrrolo[2,3-d]pyriMidin-4-aMine (3S,4S)-Tofacitinib