Intraocular hypertensive diseases such as glaucoma are treated with compounds represented by formula I ##STR1## or a pharmaceutically acceptable acid addition salt thereof, wherein R.sub.1 is alkyl of two to four carbon atoms; R.sub.2 is --(CH.sub.2).sub.n --C.sub.6 H.sub.4 --R.sub.5 ; where n is an integer from 1 to 4; and R.sub.5 is --H, --OH, halo, lower alkyl, lower alkoxy, ureido, lower alkyl-ureido, lower alkyl-amido, or formamido; R.sub.3 is hydro or hydroxy; and R.sub.4 is hydro, lower alkyl, amino, or lower alkylamino.
像青光眼这样的眼内高压疾病使用由以下式I所代表的化合物进行治疗##STR1##或其药学上可接受的酸盐,其中R.sub.1是含有两到四个碳原子的烷基;R.sub.2是--(CH.sub.2).sub.n --C.sub.6 H.sub.4 --R.sub.5;其中n是1到4的整数;而R.sub.5是--H,--OH,卤素,较低烷基,较低烷氧基,
尿素基,较低烷基-
尿素基,较低烷基-酰胺基或甲酰胺基;R.sub.3是氢基或羟基;而R.sub.4是氢基,较低烷基,
氨基或较低烷基
氨基。