There is disclosed a heterocyclic compound represented by general formula: ##STR1## wherein R.sup.1 represents hydrogen, lower alkyl or aryl; R.sup.2 represents hydrogen, hydroxyl or lower alkyl; A represents CH or N; X represents --O-- or --NH--; R.sup.3 represents hydrogen, hydroxyl or lower alkyl; R.sup.4 represents lower alkyl; represents 0 or 1, or a pharmaceutically acceptable salt thereof.
公开了一种由通式表示的
杂环化合物:##STR1##其中R.sup.1代表氢、较低的烷基或芳基;R.sup.2代表氢、羟基或较低的烷基;A代表CH或N;X代表--O--或--NH--;R.sup.3代表氢、羟基或较低的烷基;R.sup.4代表较低的烷基;代表0或1,或其药学上可接受的盐。