Venlafaxine EP Impurity - E

(5RS)-5-(4-Methoxyphenyl)-3-methyl-1-oxa-3-azaspiro-[5.5]undecane Hydrochloride; 5-(4-Methoxyphenyl)-3-methyl-1-oxa-3-azaspiro[5.5]undecane Hydrochloride; Venlafaxine related compound E (As per USP Commenting Opening 50(4));