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15(3R4S,3S4R） SS-tofacitinib Tofacitinib-15 ent-Tofacitinib Tofacitinib 3S,4S (3S,4S)-Tofacitinib Tofacitinib Impurity C Tofacitinib IMpurity A Tofacitinib Impurity C(3S,4S) Tofacitinib Impurity Q Citrate Tofacitinib IMpurity C Citrate Tofacitinib Impurity 17 Monomer 3-((3S,4S)-4-methyl-3-(methyl(7Hpyrrolo[2,3-d]pyrimidin-4-yl) (3S,4S)-4-Methyl-3-(methyl-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-β-oxo-1-piperidinepropanenitrile (3S,4S)-4-Methyl-3-(Methyl-7H-pyrrolo[2,3-d]pyriMidin-4-ylaMino)-beta-oxo-1-piperidinepropanenitrile 1-Piperidinepropanenitrile, 4-Methyl-3-(Methyl-7H-pyrrolo[2,3-d]pyriMidin-4-ylaMino)-β-oxo-, (3S,4S)- 2-isocyano-1-((3S,4S)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)ethanone 3-((3S,4S)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)-3-oxopropanenitrile SIM2908 3-((3S,4S)-4-methyl-3-(methyl(7h-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)-3-oxopropanenitrile Tofacitinib impurity 11/(3S,4S)-Tofacitinib/3-((3S,4S)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino) piperidin-1-yl)-3-oxopropanenitrile