3-클로로벤조산은 CAS 535-80-8, 분자식 C7H5ClO2, 분자량 156.57 g/mol의 할로겐화 방향족 카복실산이다. 부프로피온 관련 불순물 프로파일링에서 이는 유효성분과 구조적으로 무관한 종으로, 반응성 유전독성 불순물보다는 합성 잔류물 또는 시약 기원 방향족 산에 가깝다. 평면적 클로로벤조에이트 골격은 중등도의 소수성과 산 해리 특성을 부여하여 크로마토그래피 유지에 영향을 준다. 미량 정량은 일반적으로 LC-MS/MS, 유도체화 후 GC-MS, 또는 HPLC-UV를 통해 수행된다.
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