시탈로프람 옥살레이트 S-이성질체, 즉 에스시탈로프람 옥살레이트, CAS 219861-08-2는 선택적 세로토닌 재흡수 억제제인 시탈로프람의 광학활성 S-엔안티오머이다. (1S)-1-(3-(디메틸아미노)프로필)-1-(4-플루오로페닐)-1,3-디하이드로이소벤조푸란-5-카보니트릴의 모노옥살레이트 염으로서 분자식은 C22H23FN2O5, 분자량은 414.43 g/mol이다. 불순물 관점에서는 불완전한 키랄 분리 또는 합성 과정의 입체화학적 전환에서 유래하는 엔안티오머 관련 종 또는 공정 관련 종으로 평가된다. 정량에는 일반적으로 키랄 LC와 LC-MS/MS가 필요하며, 규제 평가 시 NMR 또는 HRMS로 보완 확인한다.
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