Diclofenac EP Impurity B는 Diclofenac Related Compound B 또는 Diclofenac Benzaldehyde Analog로도 불리며, 알데하이드성 전구체인 o-(2,6-dichloroanilino)benzaldehyde이다. CAS 22121-58-0, 분자식 C13H9Cl2NO, 분자량 266.12 g/mol을 가진다. 이 방향족 아미노벤즈알데하이드는 디클로페낙 제조 과정에서의 합성 중간체이자 공정 관련 불순물로 간주되며, 페닐아세트산 골격이 형성되기 전 불완전 전환 또는 측쇄 산화에서 유래할 수 있다. 미량 정량에는 일반적으로 LC-MS/MS, 불순물 분리를 갖춘 LC-UV, 필요 시 유도체화 후 GC-MS가 요구된다.
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