N-benzoyl-N'-pyridazinyloxyphenyl urea compounds, and antitumorous compositions containing them, and process for their preparation

摘要

An N-benzoyl-N'-pyridazinyloxyphenyl urea compound having the formula: <IMAGE> (I) wherein each of X1 and X2 is a hydrogen atom, a halogen atom or a nitro group, Y is a hydrogen atom, a halogen atom or a methyl group which may be substituted by fluorine, and Z is a hydrogen atom, a halogen atom or a trifluoromethyl group, provided that when X1 is a hydrogen atom and X2 is a hydrogen atom or a halogen atom, Y is a methyl group which may be substituted by fluorine and/or Z is a hydrogen atom or a trifluoromethyl group. The compound is useful as an active ingredient for an antitumorous composition.