Compounds having the formula
and pharmaceutically acceptable salts thereof wherein R¹ to R⁴ and n are as defined herein and X is O, S or NCN. These compounds have potassium channel opening activity and are useful, therefore for example, as cardiovascular agents.
具有以下式子的化合物
及其药学上可接受的盐 其中 R¹ 至 R⁴ 和 n 如本文所定义,X 为 O、S 或 NCN。这些化合物具有
钾通道开放活性,因此可用作心血管药物等。