Patent ID: 7622471

Claim:
A compound represented by formula (I), or a salt of the compound: wherein Ar 1 represents a pyridyl group having 1 to 3 substituents wherein the substituents are selected from the group consisting of C 1-6 alkyl, halogeno, C 1-6 alkoxy, C 1-6 alkylamino, and di(C 1-6 alkyl)amino groups, or a pyridazinyl group having 1 to 3 substituents wherein the substituents are selected from the group consisting of C 1-6 alkyl, halogeno, C 1-6 alkoxy, C 1-6 alkylamino, and di(C 1-6 alkyl) amino groups, Ar 2 represents a pyridyl group which may have 1 to 3 substituents wherein the substituents are selected from the group consisting of C 1-6 alkyl, halogeno, C 1-6 alkoxy, C 1-6 alkylamino, and di(C 1-6 alkyl)amino groups, or a pyridazinyl group which may have 1 to 3 substituents wherein the substituents are selected from the group consisting of C 1-6 alkyl, halogeno, C 1-6 alkoxy, C 1-6 alkylamino, and di(C 1-6 alkyl)amino groups, wherein is one of Ar 1 and Ar 2 is pyridazine which may be substituted as defined herein and the other one of Ar 1 and Ar 2 is pyridine which may be substituted as defined herein, R1 is a group represented by formula (1): wherein ring structure A represents an azetidine ring, pyrrolidine ring, imidazolidine ring, pyrazolidine ring, piperidine ring, piperazine ring, morpholine ring, thiomorpholine ring, hexahydropyridazine ring, hexahydropyrimidine ring, homopiperazine ring, or oxazepane ring; X represents a carbonyl group; R3 represents 1 to 4 groups on ring structure A, R3 being selected from the group consisting of a hydrogen atom, a halogeno group, a hydroxyl group, a C 1-6 alkoxy group, a C 1-6 alkoxycarbonyl group, a carboxyl group, a sulfo group, a C 1-6 alkylsulfonyl group, a C 1-6 alkyl group which may have 1 or 2 substituents, an amino group which may have 1 or 2 substituents, a carbamoyl group which may have 1 or 2 substituents, a C 1-6 acyl group, an aminosulfonyl group which may have 1 or 2 substituents, an oxo group, a hydroxyiminocarbonyl group, a C 1-6 alkoxyiminocarbonyl group, and a substituted or non-substituted 3- to 6-membered spiro alicyclic alkyl group; and R2 represents a hydrogen atom, a halogeno group, or a C 1-6 alkyl group which may have 1 or 2 substituents.