Di-Nitroso-Pyrrolopiperidine (DNPP), molecular formula C7H12N4O2 and molecular weight 184.20 g/mol, is a nitrosamine-type impurity incorporating two N-nitroso functionalities on a pyrrolopiperidine scaffold. Such species are generally associated with nitrosation of amine precursors during synthesis or exposure to nitrosating agents under acidic conditions, and they warrant assessment under genotoxic impurity control principles including ICH M7. Owing to low-level occurrence and potent ionization behavior, determination typically relies on LC-MS/MS, high-resolution LC-MS, and, where volatility permits, GC-MS with selective ion monitoring. Structural confirmation may require tandem fragmentation analysis because positional isomers and related nitrosamines can present similar chromatographic responses.
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