Disclosed herein is an antihypertensive preparation containing, as an active component, a novel quinazoline derivative represented by the following general formula or a salt thereof: ##STR1## wherein R.sup.100 means a hydrogen atom or methoxy group, R.sup.200 and R.sup.300 denote individually a hydrogen atom or lower alkoxy group, R.sup.400 is a hydrogen atom or amino group, l stands for 2 or 3, and Het is a specific hetero ring group.
本发明公开了一种降压制剂,其包含以下一般式或其盐的新型
喹唑啉衍
生物作为活性成分:##STR1##其中,R.sup.100表示氢原子或甲氧基,R.sup.200和R.sup.300分别表示氢原子或低级烷氧基,R.sup.400表示氢原子或
氨基,l表示2或3,Het表示特定的杂环基团。