l,R2 is a member selected from the group consisting of hydrogen and loweralkyl, R3 is a member selected from the group consisting of hydrogen, loweralkyl, and cyclopentyl and cyclohexyl, Y and Z are each a member selected from the group consisting of hydrogen, halo, loweralkyl, and loweralkyloxy; and the pharmaceutically acceptable acid addition salts thereof in admixture with a pharmaceutical car