Pyridine derivatives of the formula ##STR1## wherein the ring A stands for an optionally further substituted benzene ring; the ring B stands for an optionally substituted pyridine ring; Q stands for hydroxyl group, or OQ.sup.1 or Q.sup.1 wherein Q.sup.1 stands for an optionally substituted aliphatic hydrocarbon group; and n denotes 0 or 1, or their salts, which have potassium.channel opening activity and are useful as therapeutic agents of circulatory diseases such as angina pectoris, hypertension, etc.
公式为##STR1##的
吡啶衍生物,其中环A代表可选进一步取代的苯环;环B代表可选取代的
吡啶环;Q代表羟基,或OQ.sup.1或Q.sup.1,其中Q.sup.1代表可选取代的脂肪族碳氢化合物基团;n表示0或1,或其盐,具有
钾通道开放活性,可用作治疗循环系统疾病,如心绞痛、高血压等的治疗剂。