O isômero S do oxalato de citalopram, também denominado oxalato de escitalopram, CAS 219861-08-2, é o enantiômero S opticamente ativo do inibidor seletivo da recaptação de serotonina citalopram. Como sal monooxalato de (1S)-1-(3-(dimetilamino)propil)-1-(4-fluorofenil)-1,3-diidroisobenzofurano-5-carbonitrilo, apresenta fórmula molecular C22H23FN2O5 e massa molar de 414,43 g/mol. No perfil de impurezas, é uma espécie relacionada por quiralidade ou de processo, associada à resolução quiral incompleta ou à inversão estereoquímica durante a síntese. A quantificação normalmente exige LC quiral e LC-MS/MS, com confirmação por NMR ou HRMS quando necessária para avaliação regulatória.
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