세프디니르 7-에피머(CAS 178601-89-3)는 세팔로스포린 계열의 입체화학적 불순물로서, 옥심 측쇄의 7-위치에서 에피머화되어 생성된다. 이는 주로 합성 과정 또는 산성, 염기성, 열적 스트레스 조건에서 형성된다. 분자식은 C14H13N5O5S2이고 분자량은 395.41 g/mol이다. 조성 변화가 아니라 입체배열 변화이므로, 독립적인 분해산물보다는 관련 물질로 분류되며 직교적 특성분석이 필요하다. 검출과 정량에는 역상 LC-MS, LC-MS/MS, 키랄 또는 고분해능 크로마토그래피가 일반적으로 요구되며, UV 검출만으로는 확정적 동정이 충분하지 않은 경우가 많다.
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