La N-nitroso-2-pirrolidona, CAS 54634-49-0, es una nitrosamina cíclica con fórmula molecular C4H6N2O2 y peso molecular de 114,1 g/mol. Su estructura está relacionada con la 2-pirrolidona y puede formarse por nitrosación de la lactama correspondiente en condiciones ácidas en presencia de nitrito u այլ agentes nitrosantes. Como miembro de la clase de las nitrosaminas, se considera una impureza potencialmente genotóxica en los marcos regulatorios de ICH M7. La determinación a nivel de traza suele requerir técnicas muy selectivas como LC-MS/MS o GC-MS, a menudo con estándares internos isotópicamente marcados, debido a la exigencia de sensibilidad ultrabaja y a posibles efectos de matriz.
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