Levetiracetam EP Impurity A, 즉 levetiracetam carboxylic acid racemate는 피롤리돈 골격을 갖는 모약물에서 유래한 라세미체 개환형 카복실산이다. CAS 67118-31-4, 분자식 C8H13NO3, 분자량 171.19 g/mol. 이 물질은 2-옥소피롤리딘 고리의 개환으로 형성되는 가수분해성 또는 합성 기원 부산물로 간주되며, 반응성 유전독성 계열에는 해당하지 않는다. 높은 극성과 유효성분과의 구조적 유사성 때문에 정량은 일반적으로 역상 HPLC-UV 또는 LC-MS/MS 확인법에 의존하며, 극미량 불순물 특성화에는 LC-HRMS와 같은 직교 분석법이 요구된다.
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