N-Nitroso bis(2-chloroethyl)amine(CAS 67856-68-2, 분자식 C4H8Cl2N2O, 분자량 171.02 g/mol)은 강한 친전자성과 알킬화 반응성을 갖는 이염소화 알킬니트로소아민이다. 이 불순물은 bis(2-chloroethyl)amine 계 중간체의 니트로소화 또는 염소에틸화 시약 합성 중 공정 유래 오염으로 형성될 수 있다. 확인된 유전독성 불순물로서 ICH M7의 위험 기반 관리 범주에 해당한다. 극미량 존재와 매우 낮은 규제 한계 때문에 정량에는 LC-MS/MS 또는 GC-MS와 같은 고선택성 분석법이 일반적으로 필요하며, 동위원소 희석법이 자주 적용된다.
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