发明授权
US4914093A Pyridazinone derivatives, their preparation and use 失效
哒嗪酮衍生物,其制备和用途

Pyridazinone derivatives, their preparation and use
摘要:
Compounds of formula (I): ##STR1## (wherein Q is oxygen or sulfur, the dotted line is a single or double bond, A is alkylene, and R.sup.1 -R.sup.5 are a variety of atoms or organic groups)have excellent ability to potentiate myocardial contractivity and a variety of other properties, and can be used to treat cardiac disorders.
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