Desvenlafaxine (O-Desmethylvenlafaxine) fumarate is a selective serotonin and norepinephrine reuptake inhibitor. Desvenlafaxine (O-Desmethylvenlafaxine) fumarate is the major metabolite of the antidepressant venlafaxine. Desvenlafaxine (O-Desmethylvenlafaxine) fumarate has the potential for the research of depression and related disorders and diseases (extracted from patent WO2009049354A1).