발프로산 EP 불순물 L은 2-메틸발레르산으로 확인되는 분지형 지방족 카복실산이며, CAS 97-61-0, 분자식 C6H12O2, 분자량 116.16 g/mol을 가진다. 발프로에이트 화학에서 이는 알킬 사슬 재배열 또는 합성 제어 미흡으로 발생할 수 있는 구조적으로 관련된 공정 불순물 또는 분해 연관 부산물로 간주된다. 유사한 크로마토그래피 거동과 낮은 휘발성 때문에 정량에는 일반적으로 유도체화 후 GC-MS 또는 GC-FID가 요구되며, 복잡한 매트릭스에서는 확인성 특성화를 위해 LC-MS/MS가 사용될 수 있다. 이는 유전독성 불순물 범주에 속하지 않지만, 불순물 프로파일 규격과 미량 질량수지 평가에 중요하다.
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