Heumann Pharma Gmbh & Co.

Reinhold Weidner

Peter Morsdorf

Heidrun Engler

Rolf Herter

Kurt H Ahrens

Volker Pfahlert

Kurt-Henning Ahrens

New diazine derivatives corresponding to the general formula I ##STR1## and the physiologically acceptable salts thereof are described. The compounds according to the invention are new positive inotropic compounds having a higher and/or more selective action than compounds hitherto known and are therefore suitable for the treatment and prevention of diseases of the heart and circulation.

Cardiotonic thiadiazine derivatives

New 6-oxo-pyridazine derivatives corresponding to the general formula I ##STR1## which represent new, positive inotropic compounds having a higher and more selective inotropy-increasing activity are described. A process of preparation and the medical use of these substances or of a medicament containing these substances are also described.

6-oxo-pyridazine derivatives, a process for their preparation and

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Nuremberg, Germany

Reinhold Weidner