Atorvastatin Related Compound A는 desfluoroatorvastatin 및 Atorvastatin EP Impurity A로도 불리며, 플루오르가 결여된 아토르바스타틴 유사체의 칼슘염이다. CAS는 433289-83-9이다. 염의 조성식은 C66H70CaN4O10, 자유염기형은 C33H36N2O5이며, 분자량은 칼슘염 1119.38 g/mol, 중성종 540.65 g/mol이다. 이 불순물은 p-플루오로페닐 약효기 대신 비치환 페닐기를 갖는 구조로부터 기인하는 공정성 또는 합성 유래 불순물이다. 아토르바스타틴 및 관련 물질과의 분리를 위해서는 통상 LC-MS/MS가 필요하며, 구조 확인에는 HRMS와 NMR이 사용된다.
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