El monómero N-nitrosopiperazina, también denominado mononitrosopiperazina, es una impureza de tipo nitrosamina cíclica con fórmula molecular C4H9N3O y masa molecular de 115,13 g/mol. El CAS 5632-47-3 identifica este derivado N-nitroso de la piperazina, una clase química asociada con activación metabólica, alquilación del ADN y preocupación genotóxica conforme a los principios de ICH M7. Puede formarse bajo condiciones nitrosantes durante la síntesis o por contaminación de intermedios que contienen piperazina. Su confirmación estructural y cuantificación traza suelen requerir LC-MS/MS o GC-MS, con separación cromatográfica adaptada a nitrosaminas volátiles y control estricto de la nitrosación artefactual.
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