Compounds of the formula: ##STR1## in which m is one of the integers 1, 2 or 3; n is one of the integers 0, 1 or 2; o is one of the integers 0, 1 or 2; R.sub.1 and R.sub.2 are, independently, hydrogen, hydroxyl, alkyl, alkoxy, alkanoyloxy, trifluoromethyl, halo, or, when taken together, 3,4- methylenedioxy; R.sub.3 is alkyl, ##STR2## where R. sub.4 and R.sub.5 are, independently, hydrogen, hydroxyl, alkyl, alkoxy, alkanoyloxy, halo or trifluoromethyl; and R.sub.6 is hydrogen or halo; or a pharmaceutically acceptable salt thereof.
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机译：下式的化合物：其中m是整数1、2或3之一; n是整数0、1或2之一; o是整数0、1或2之一; R 1和R 2独立地是氢，羟基，烷基，烷氧基，链烷酰氧基，三氟甲基，卤素，或合在一起时是3，4-亚甲二氧基; R 3是烷基，其中R 4和R 5独立地是氢，羟基，烷基，烷氧基，烷酰氧基，卤素或三氟甲基; R 6是氢或卤素;或其药学上可接受的盐。
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