Pharmaceutical compositions and method of producing anti-Parkinsonism activity

A method of producing anti-parkinsonism activity which comprises administering internally to an animal requiring said activity a nontoxic amount sufficient to produce said activity of a compound of the formula:

• ##STR3## in which:
• R is hydrogen, lower alkyl of from 1 to 4 carbon atoms, hydroxyethyl or lower alkenyl of from 3 to 5 carbon atoms;
• R.sub.1 is hydroxy, methoxy, ethoxy or alkanoyloxy;
• R.sub.2 is hydrogen, hydroxy, methoxy, ethoxy or alkanoyloxy;
• R.sub.3 is hydrogen, chloro, bromo, fluoro, methyl or trifluoromethyl;
• and
• said alkanoyl moieties have from 2 to 5 carbon atoms,
• provided that when R.sub.1 and R.sub.2 are both methoxy or ethoxy, R is hydrogen, or a pharmaceutically acceptable acid addition salt of said compound.