Compounds of formula
(wherein R, R₁, R₂ and R₃ have the meanings reported in the specification), their preparation and the compositions for pharmaceutical use containing them as active ingredient are described. The compounds of formula I have dopaminergic vasodilator activity and they may be used in pharmaceutical field.
式化合物
(其中 R、R₁、R₂ 和 R₃ 的含义见说明书)、其制备方法以及含有它们作为活性成分的药用组合物。式 I 的化合物具有
多巴胺能血管扩张活性,可用于制药领域。