Levetiracetam Related Compound B는 L-2-Aminobutanamide 또는 Levetiracetam EP Impurity G로도 불리는 자유염기형 아미드성 아민 불순물로, CAS 7324-11-0에 해당한다. 분자식 C4H10N2O, 분자량 102.14 g/mol의 이 물질은 레베티라세탐 합성 과정에서의 불완전한 고리화 또는 아미드화 단계에서 유래할 수 있는 소분자 고극성 합성 중간체이자 공정 기원 부산물이다. 발색단이 없는 염기성 불순물이므로 동정과 정량에는 LC-MS/MS 또는 유도체화 GC-MS가 일반적으로 필요하며, 분리에는 HILIC 또는 이온쌍 크로마토그래피가 자주 사용된다. 이러한 특성은 약전 및 ICH 불순물 관리 체계에서 중요하다.
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