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(┬??)-3-Methoxy-17-methylmorphinan Hydrobromide is the racemic mixture of Dextromethorphan (D299445) and Levomethorphan (L375850). Dextromethorphan is an antitussive compound showing analgesic properties; used in cough medication formulations. Levomethorphan is an antitussive medicine, a narcotic and controlled substance.