It is an impurity present in Tofacitinib. Tofacitinib is a small-molecule Janus-associated kinase inhibitor, which is used for the treatment of adult patients with moderate to severe rheumatoid arthritis. Also it has had an inadequate response or intolerance to methotrexate therapy.
Additional information on N-Nitroso Tofacitinib
3-((3R, 4R)-4-methyl-3-(methyl(7-nitroso-7H-pyrrolo[2, 3-d]pyrimidin-4-yl)amino)piperidin-1-yl)-3-oxopropanenitrile
Tofacitinib Nitroso Impurity 1
Cada, D. J., Demaris, K., Levien, T. L., & Baker, D. E. (2013). Tofacitinib. Hospital Pharmacy, 48(5), 413–424. https://doi.org/10.1310/hpj4805-413
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