| 摘要 |
Compounds of the following formula (I): <IMAGE> (I) where R1 and R2 are alkyl or cycloalkyl, which may be substituted, R4 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.
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