Pyridazinones, processes for producing them, pharmaceutical preparations containing these compounds and the use thereof

Abstract From the Canadian patent

Pyridazinones, processes for producing them pharmaceutical preparations containing these compounds and the use thereof. Abstract of the disclosure The invention concerns compounds of formula I (I), wherein R is a halogen atom or the amino acetylamino, methyl, cyano, hydroxyl, methoxy or trifluoromethyl group the tautomeric forms thereof, and acid addition salts of the compounds in which R represents amino. The products have antithrombotic activity.They can be prepared according to methods known per se.