발프로산 EP 불순물 B, CAS 20225-24-5는 발프로에이트 불순물 프로파일에 속하는 저분자 지방족 카복실산으로, 분자식 C7H14O2 및 분자량 130.18 g/mol을 갖는다. 이 물질의 존재는 일반적으로 합성 경로에서 유래하는 부산물 또는 분지형 지방산 유도체의 제조와 저장 중 발생하는 산화 및 가수분해 전환과 연관된다. 모화합물과의 구조적 근접성 때문에 극미량 정량에는 GC-MS, LC-MS/MS, 그리고 유도체화 기반의 보조 절차가 요구되며, 필요 시 고분해능 질량분석으로 확인한다. 규제 평가의 초점은 불순물 규격, 동정, 및 안정성 거동에 있다.
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