| 摘要 |
The compounds of formula I, <IMAGE> I where R1, R2 and R3 have various significances, and physiologically acceptable hydrolyzable derivatives thereof having the hydroxy group in the 2 position of the 3-aminopropoxy side chain in esterified form, are useful as cardiotonic, antiarrhythmic, alpha - and beta -adrenoceptor blocking agents.
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