| 摘要 |
Heterocyclic compounds of the formula <IMAGE> (I) wherein Het denotes optionally substituted pyridazinyl, pyrimidinyl, pyrazinyl or substituted pyridyl, R1 is hydrogen or methyl and R2 is lower alklyl, optionally substituted phenyl-lower alkyl, carboxy-lower alkyl or functionally modified carboxy-lower alkyl, their condensation products with aldehydes, ketones or carbonic acid and their N-oxides, which are valuable (cardioselective) beta -receptor blocking agents, and/or (cardioselective) beta -receptor-stimulants.
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