PYRIDAZINONE HYDROCHLORIDE COMPOUND AND METHOD FOR PRODUCING THE SAME

摘要

The present invention relates to a 3/2-hydrochloride of 4-chloro-5-[3- (4-benzylpiperazin-1- yl)carbonylmethoxy-4- methoxybenzylamino]- 3(2H)-pyridazinone, and also relates to a method for producing the 3/2- hydrochloride of 4-chloro-5-[3- (4-benzylpiperazin-1- yl)carbonylmethoxy-4- methoxybenzylamino]- 3(2H)-pyridazinone which comprises crystallizing in an alcohol type solvent or an alcohol type-ester type mixture solvent in the presence of hydrogen chloride and water.