Tofacitinib N oxide impurity (CAS No: 2028267-73-2) Or (3R,4R)-4-Methyl-3-(methyloxido-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-v-oxo-1-piperidinepropanenitrile, Tofacitinib N oxide is an impurity of Tofacitinib, Tofacitinib is a CYP3A4 substrate and a minor CYP2C19 substrate, used in the treatment of rheumatoid arthritis.
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