Rotigotine Impurity 7

O-Acetylrotigotine Hydrochloride is used as a reactant in preparation of (6S)??-??(-??)??-??5,??6,??7,??8-??tetrahydro-??6-??[propyl-??(2-??thienyl)??ethyl]??amino-??1-??naphthol (rotigotine) using improved alkylation and hydrolysis steps