El isómero S del oxalato de citalopram, también denominado oxalato de escitalopram, CAS 219861-08-2, es el enantiómero S ópticamente activo del inhibidor selectivo de la recaptación de serotonina citalopram. Como sal monooxalato de (1S)-1-(3-(dimetilamino)propil)-1-(4-fluorofenil)-1,3-dihidroisobenzofurano-5-carbonitrilo, presenta fórmula molecular C22H23FN2O5 y peso molecular de 414,43 g/mol. En el perfil de impurezas, se considera una especie relacionada por quiralidad o de proceso, derivada de resolución incompleta o inversión estereoquímica durante la síntesis. Su cuantificación suele requerir LC quiral y LC-MS/MS, con confirmación por NMR o HRMS cuando se necesita evaluación regulatoria.
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