Patent ID: 8642626

Claim:
A compound represented by the formula [I], or a pharmaceutically acceptable salt thereof: wherein R 1 represents a hydrogen atom or a C 1-6 alkyl group (wherein the C 1-6 alkyl group may be substituted with 1 to 3 halogen atoms), R 2 represents a hydrogen atom or a C 1-6 alkyl group (wherein the C 1-6 alkyl group may be substituted with 1 to 3 halogen atoms), Ar represents a phenyl group or a heteroaryl group (wherein the phenyl group or the heteroaryl group is substituted with 1 to 3 substituents selected from the group consisting of —SO 2 NR a R b , —SO 2 R c , —NR d SO 2 R e , a C 1-6 alkyl group, an amino group, and a halogen atom), R a and R b , which may be the same or different, each represent a hydrogen atom or a C 1-6 alkyl group (wherein the C 1-6 alkyl group may be substituted with one or two substituents selected from the group consisting of an amino group, a C 1-6 alkylamino group, a di-C 1-6 alkylamino group, and a hydroxyl group) or R a and R b may form a saturated or unsaturated 5- or 6-membered ring, which is formed together with a nitrogen atom to which they bind, and which may further contain one or more nitrogen atoms, oxygen atoms or sulfur atoms, R c represents a hydroxyl group, a C 1-6 alkyl group, or a C 1-6 alkoxy group, R d represents a hydrogen atom or a C 1-6 alkyl group, R e represents a C 1-6 alkyl group or an amino group, Y 1 represents —(CH 2 ) n1 —, —(CH 2 ) n2 —NR f —(CH 2 ) n3 —, —(CH 2 ) n4 —O—(CH 2 ) n5 —, —(CH 2 ) n6 —NHC(═O)—(CH 2 ) n7 —, —(CH 2 ) n8 —C(═O)NH—(CH 2 ) n9 —, ethynylene, piperazin-1,4-yl, phenylene, or heteroarylene, R f represents a hydrogen atom or a C 1-6 alkyl group, n1 to n5 each represent an integer from 0 to 6, provided that the sum of n2 and n3 is 6 or less, and the sum of n4 and n5 is 6 or less, n6 to n9 each represent an integer from 0 to 5, provided that the sum of n6 and n7 is 5 or less, and the sum of n8 and n9 is 5 or less, and Y 2 represents an aryl group, a heteroaryl group, a partially saturated condensed polycyclic heteroaryl group {wherein the aryl group, heteroaryl group, or partially saturated condensed polycyclic heteroaryl group may be substituted with 1 to 3 substituents selected from the group consisting of a C 1-6 alkyl group, a C 3-6 cycloalkyl group, a C 1-6 alkoxy group (wherein the C 1-6 alkyl group, C 3-6 cycloalkyl group, or C 1-6 alkoxy group may be substituted with 1 to 3 halogen atoms), a cyano group, and a halogen atom} or a C 3-6 cycloalkyl group.