Cefdinir Sulfoxide, CAS 934986-48-8은 3세대 세팔로스포린계 항생제 세프디니르의 산화된 설폭사이드 유도체로서, 보관 또는 제조 과정에서 티오에터 부분의 산화적 분해에 의해 주로 생성된다. 분자식 C14H13N5O6S2, 분자량 411.41 g/mol이며, 베타락탐을 포함하는 세팔로스포린 골격은 유지되지만 모화합물보다 극성이 증가하고 크로마토그래피 거동이 달라진다. 검출과 정량에는 일반적으로 역상 LC와 다이오드 어레이 검출, 확인용 LC-MS/MS 또는 고분해능 MS가 요구된다. 약물 관련 불순물로서 효능 저하, 분해 경로, 규격 설정의 맥락에서 평가된다.
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