英文别名Tofacitinib Impurity 18; Tofacitinib N-Oxide; Tofacitinib Impurity 24; CP-690550N-oxide; Tofacitib related impurities 8; Tofacitinib-23; 1-Piperidinepropanenitrile, 4-methyl-3-(methyloxido-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-β-oxo-, (3R,4R); (3R,4R)-4-Methyl-3-(methyloxido-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-beta-oxo-1-piperidinepropanenitrile