Patent ID: 7211577

Claim:
A phenylpyridazine derivative represented by the formula (1): wherein: R 1 is optionally substituted or unsubstituted C 1 –C 12 alkyl, or substituted or unsubstituted C 2 –C 12 alkenyl; wherein the alkyl can be linear, branched, cyclic or a structure containing a cylic structure therein, wherein, if substituted, the substituent on the alkyl or alkenyl represented by R 1 is independently a substituted or unsubstituted C 6 –C 14 aryl or a 5- or 6-membered heteroaryl having 1 to 3 nitrogen atoms; and said aryl or heteroaryl, wherein if substituted, the aryl or heteroaryl are substituted with 1 to 3 substituents selected from the group consisting of halogen, C 1 –C 12 alkyl, C 1 –C 12 alkoxy, and combinations thereof; R 2 and R 3 each independently represents hydrogen or C 1 –C 12 alkyl, hydroxy C 1 –C 12 alkyl, dihydroxy C 1 –C 12 alkyl or C 3 –C 12 alkynyl, or R 2 and R 3 are fused together with the adjacent nitrogen atom to form a substituted or unsubstituted, nitrogen-containing, saturated 5- to 7-membered heterocyclic group; wherein, if substituted, the 5- to 7-membered heterocyclic group is substituted with at least one of a halogen atom, C 1 –C 12 alkyl, C 1 –C 12 alkoxycarbonyl or phenyl-C 1 –C 7 alkyl, X, Y and Z each independently represents hydrogen, halogen, substituted or unsubstituted C 1 –C 12 alkyl, C 1 –C 12 alkoxy, C 1 –C 12 alkylthio, C 1 –C 12 alkylsulfinyl, C 1 –C 12 alkylsulfonyl, or C 6 –C 14 aryl; wherein the C 1 –C 12 alkyl is optionally substituted with at least one of a halogen atom or C 1 –C 12 alkoxy, the aryl is optionally substituted with at least one of a halogen, C 1 –C 12 alkyl, or C 1 –C 12 alkoxy; and n stands for a number of from 1 to 5; with the proviso that R 2 and R 3 are not hydrogens or the same C 1 –C 3 alkyl groups at the same time when R 1 is a benzyl group or a C 1 –C 3 alkyl group; or a salt thereof.