Bromfenac Impurity 5, 즉 WAY 127039-A-1 sodium salt는 분자식 C15H9BrNNaO4, 분자량 370.13 g/mol, CAS 1391052-54-2를 갖는 방향족 브롬화 벤조산 유도체이다. 구조적으로 이는 bromfenac 화학과 연관된 이온성 불순물로서, 염 형성 또는 아실화 및 헤테로아릴 결합 단계에서의 합성적 분기에서 생성될 수 있다. 브롬 함유 종은 결정화 후에도 잔존할 수 있으므로 불순물 프로파일링에서 중요하다. 동정과 정량에는 일반적으로 LC-MS/MS, 고해상도 LC-MS 및 NMR이 필요하며, UV 검출만으로는 확정적인 구조 배정이 어렵다.
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