Escitalopram (oxalate) (Standard) is the analytical standard of Escitalopram (oxalate). This product is intended for research and analytical applications. Escitalopram ((S)-Citalopram) oxalate, the S-enantiomer of racemic Citalopram, is a selective serotonin reuptake inhibitor (SSRI) with a K_i of 0.89 nM. Escitalopram oxalate has ∼30 fold higher binding affinity than its R(-)-enantiomer and shows selectivity over both dopamine transporter (DAT) and norepinephrine transporter (NET). Escitalopram oxalate is an antidepressant for the research of major depression^[1][2].