Synonyms: Venlafaxine Hydrochloride Imp. E (EP), Venlafaxine Imp. E (EP), (5RS)-5-(4-Methoxyphenyl)-3-methyl-1-oxa-3-azaspiro[5.5]undecane Hydrochloride, Venlafaxine Hydrochloride Imp. E (EP) as Hydrochloride, Venlafaxine Hydrochloride Impurity E as Hydrochloride, Venlafaxine Impurity E as Hydrochloride