N-Nitroso 5,6-Dihydro Tofacitinib ist eine nitrosaminbezogene Verunreinigung, die durch N-Nitrosierung des Piperidin-Stickstoffs im 5,6-Dihydro-Tofacitinib-Gerüst entsteht. Mit der Summenformel C16H21N7O2 und einer Molekülmasse von 343,38 g/mol entspricht die Struktur einem potenziell genotoxischen, in Spuren auftretenden Prozess- oder Abbauprodukt. Nitrosamine unterliegen aufgrund ihres kanzerogenen Risikopotenzials den Vorgaben von ICH M7 und verwandten risikobasierten Leitlinien. Der Nachweis erfordert in der Regel hochselektive LC-MS/MS, häufig ergänzt durch hochauflösende Massenspektrometrie und orthogonale chromatographische Bestätigung, da UV-Methoden für die Spurenanalytik unzureichend sind.
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