Wikipedia
Desmethylcitalopram
Desmethylcitalopram is an active metabolite of the antidepressant drugs citalopram ( racemic) and escitalopram (the S- enantiomer, which would be called desmethylescitalopram). Like citalopram and escitalopram, desmethylcitalopram functions as a selective serotonin reuptake inhibitor (SSRI), and is responsible for some of its parents' therapeutic benefits.