Buspirone EP Impurity H, 즉 Buspirone Diester Dimer는 buspirone의 에스터화 화학과 연관된 공정 유래 이량체 불순물로, 합성과 분리 과정에서의 분자간 축합 또는 전이에스터화에 의해 형성될 수 있다. CAS 2708578-34-9, 분자식 C33H50N8O4, 분자량 622.80 g/mol을 가지며, 니트로사민과 같은 반응성 부류가 아니라 비휘발성의 구조적으로 대칭적인 부산물에 해당한다. 높은 극성과 모화합물과의 근접한 구조적 유사성 때문에 미량 분석에는 일반적으로 역상 LC와 고분해능 MS 또는 LC-MS/MS가 필요하며, UV 단독 확인은 동정의 확증성이 부족할 수 있다.
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