Compounds of the following formula (I): ##STR1## where R.sup.1 and R.sup.2 are alkyl or cycloalkyl, which may be substituted, R.sup.4 is aryl such as phenyl which may be substituted, L is a direct bond or an oxygen containing linking group, R is a hydrogen, alkyloxy, alkyl, halogen or haloalkyl and Het is a pyridinyl or pyridazinyl group. The compounds can be used antihypertensives or myocardial relaxants. Also part of the invention are pharmaceutical compositions, intermediates and methods of synthesis.
以下式子(I)的化合物:##STR1## 其中R.sup.1和R.sup.2是烷基或环烷基,可以被取代,R.sup.4是苯基,例如苯基可以被取代,L是直接键或含氧连结基,R是氢,烷氧基,烷基,卤素或卤代烷基,Het是
吡啶基或
吡嗪基。这些化合物可用作降压剂或心肌松弛剂。此外,本发明还涉及制药组合物、中间体和合成方法。