Compounds of the formula: ##STR1## and their pharmaceutically acceptable non-toxic salts, wherein R.sub.1 is alkyl of 5 to 8 carbon atoms which is straight chained or .alpha.-substituted by a methyl group or .alpha.,.alpha.-disubstituted by methyl groups and R.sub.5 is hydrogen, R.sub.6 or CO.R.sub.6 wherein R.sub.6 is alkyl of 1 to 4 carbon atoms or alkyl of 1 to 4 carbon atoms substituted by NR.sub.7 R.sub.8 wherein R.sub.7 and R.sub.8 are each hydrogen or alkyl of 1 to 4 carbon atoms or NR.sub.7 R.sub.8 is pyrrolidino, piperidino or morpholino, have been found to possess good antihypertensive activity while being of low-toxicity and substantially free of sedative side effects.
公式为:##STR1##及其药学上可接受的无毒盐,其中R.sub.1为5至8个碳原子的直链或.alpha.-取代的甲基或.alpha.,.alpha.-二取代的甲基,R.sub.5为氢,R.sub.6或CO.R.sub.6,其中R.sub.6为1至4个碳原子的烷基或1至4个碳原子的烷基,其被NR.sub.7R.sub.8取代,其中R.sub.7和R.sub.8分别为氢或1至4个碳原子的烷基,或NR.sub.7R.sub.8为
吡咯烷基,
哌啶基或
吗啡环基,已被发现具有良好的降压活性,同时毒性低,基本无镇静副作用。