부데소나이드 EP 불순물 C, 즉 D-Homobudesonide는 부데소나이드의 제조 및 분해 화학과 연관된 구조적 유사 불순물인 코르티코스테로이드이다. CAS 1040085-99-1, 분자식 C25H34O6, 분자량 430.43 g/mol을 갖는다. 이 물질은 글루코코르티코이드 스테로이드 골격을 유지하면서 아세탈 측쇄의 호몰로지를 보이며, 이는 합성 경로 특이적 부산물 또는 공정 중 재배열로부터 기인할 수 있다. 모화합물과의 높은 구조적 유사성 때문에 미량 수준의 특성 규명과 정량에는 DAD 검출 HPLC와 확인용 LC-MS/MS가 일반적으로 요구되며, 구조 배정이 필요한 경우 NMR이 추가로 사용된다.
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