Upadacitinib N1-Tosyl Impurity(CAS 2411540-30-0)는 JAK1 억제제 골격의 피롤리딘 질소에서 발생하는 N-설포닐화에 기인한 공정 관련 불순물이다. 분자식 C24H25F3N6O3S, 분자량 534.55 g/mol을 가지며, 단순한 분해물이 아니라 구조적으로 규정된 합성 부산물로 간주된다. 방향족 토실 치환기는 극성과 이온화 거동을 변화시키므로, 일반적으로 고분해능 MS를 포함한 LC-MS/MS, HPLC-UV, 필요 시 NMR에 의한 규명이 요구된다. 이러한 불순물 관리는 ICH Q3A/Q3B 기반의 불순물 프로파일링과 관련되며, 합성 중 이월되는 경우에는 유전독성 불순물 평가 틀에서의 검토가 필요할 수 있다.
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