| abstract |
(57) [Problem] To provide a novel N-hydroxyurea derivative having an antiallergic action or an antiinflammatory action. Kind Code: A1 Abstract: Formula (I) (In the formula, any one of R 1 , R 2 , and R 3 represents a 3-pyridyl group or a 3-pyridylalkyl group, and R 1 , R 2 , R 3 The other 3 groups each independently represent H, a halogen atom or a C 1 -C 8 alkyl group which may have a substituent. R 4 represents H or a lower alkyl group. R 5 represents H, a lower alkyl group, a C 3 -C 7 cycloalkyl group or a phenyl group which may have a substituent (the substituent represents a halogen atom, a lower alkyl group or a lower alkoxy group). A represents bond, an alkylene group of C 1 -C 20, an alkenylene group or C 2 -C 8 alkynylene group C 2 -C 8. Or a pharmacologically acceptable salt thereof, or a hydrate or solvate thereof. |