Cefdinir Thiazine Analog, CAS 178422-39-4는 세프디니르 화학과 연관된 공정 기원 이종고리 불순물로, 세팔로스포린 골격 내에서의 고리화, 황의 산화수 재배열 또는 합성 후반부 분기 반응에서 유래할 가능성이 있다. 분자식 C14H15N5O6S2, 분자량 413.43 g/mol이며, beta-락탐 유래 헤테로원자 배열은 유지하지만 고리 위상과 치환 양상이 달라 크로마토그래피 거동과 UV 반응성이 변할 수 있다. 검출 및 정량에는 일반적으로 LC-MS/MS, 고분해능 LC-MS, 보완적 LC-UV가 요구되며, 구조적 경고가 있는 경우 ICH 불순물 및 변이원성 위험 평가 기준에 따라 해석한다.
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