발프로산 EP 불순물 H로 규정되는 발레로니트릴(CAS 110-59-8)은 발프로에이트 관련 물질의 합성 유래 및 분해 유래 불순물 프로파일에 연관된 저분자 지방족 니트릴이다. 분자식 C5H9N, 분자량 83.1 g/mol로서, 복잡한 약리 작용기에서 유래한 분해 생성물이라기보다 휘발성을 띠는 단순한 전구체 기원 불순물에 해당한다. 그 존재는 일반적으로 공정 잔류, 부반응 생성, 또는 가수분해 및 산화 전환 경로의 관점에서 평가된다. 휘발성과 낮은 극성 때문에 미량 수준의 동정과 정량에는 헤드스페이스 GC-MS, GC-FID 및 확인용 LC-MS/MS가 흔히 요구된다.
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