?? ?? 4-(Hydroxyamino)-4-oxobutanoic acid 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 3-PiperidinaMine, 1-acetyl-N,4-diMethyl-N-1H-pyrrolo[2,3-d]pyriMidin-4-yl-, (3R,4R)- (9CI) (3S,4S)-1-benzyl-N,4-dimethylpiperidin-3-amine hydrochloride Malonyl chloride (3R,4R)-1-benzyl-N,4-dimethylpiperidin-3-amine dihydrochloride Tofacitinib (3S,4S)-1-Benzyl-N,4-dimethylpiperidin-3-amine CYANOACETIC ACID-OSU N-Hydroxysuccinimide Tofacitinib Impurity 2