A compound represented by the following Chemical Formula 1, or a pharmaceutically acceptable salt thereof: in Chemical Formula 1, A is a benzene ring, or a 6-membered heteroaromatic ring containing one to three nitrogen atoms, R 1 is C 1-10 alkyl; C 6-10 aryl; C 1-10 heteroaryl containing one to four heteroatoms each independently selected from the group consisting of nitrogen, oxygen, and sulfur; or C 3-10 heterocycloalkyl containing one to four heteroatoms each independently selected from the group consisting of nitrogen, oxygen, and sulfur, wherein R 1 is unsubstituted or substituted with one to three substituents each independently selected from the group consisting of halogen, cyano, hydroxy, amino, NH(C 1-4 alkyl), N(C 1-4 alkyl) 2, C 1-4 alkyl, C 1-4 haloalkyl, and C 1-4 alkoxy, R 2 and R 3 are each independently hydrogen, halogen, C 1-4 alkyl, C 1-4 alkoxy, or C 1-4 haloalkyl, L 1 is a bond, O, S, SO 2, NH, N(C 1-4 alkyl), NHCO, N(C 1-4 alkyl)CO, NHCONH, N(C 1-4 alkyl)CONH, NHCON(C 1-4 alkyl), N(C 1-4 alkyl)CON(C 1-4 alkyl), CONH, CON(C 1-4 alkyl), SO 2 NH, or SO 2 N(C 1-4 akyl), L 2 is methylene, or ethylene, one of X 1 and X 2 is CH 2, and the other is N-CO-R', wherein R' is C 1-4 alkyl; C 2-4 alkenyl; or C 2-4 alkynyl, each of which is unsubstituted or substituted by one to three substituents each independently selected from the group consisting of halogen, cyano, hydroxy, amino, NH(C 1-4 alkyl), N(C 1-4 alkyl) 2, C 3-10 cycloalkyl, and C 3-10 heterocycloalkyl containing one or two heteroatoms each independently selected from the group consisting of nitrogen, and oxygen, and a and b are each independently represent an integer of 0 to 4. A is a benzene ring, or a 6-membered heteroaromatic ring containing one to three nitrogen atoms, R 1 is C 1-10 alkyl; C 6-10 aryl; C 1-10 heteroaryl containing one to four heteroatoms each independently selected from the group consisting of nitrogen, oxygen, and sulfur; or C 3-10 heterocycloalkyl containing one to four heteroatoms each independently selected from the group consisting of nitrogen, oxygen, and sulfur, wherein R 1 is unsubstituted or substituted with one to three substituents each independently selected from the group consisting of halogen, cyano, hydroxy, amino, NH(C 1-4 alkyl), N(C 1-4 alkyl) 2, C 1-4 alkyl, C 1-4 haloalkyl, and C 1-4 alkoxy, R 2 and R 3 are each independently hydrogen, halogen, C 1-4 alkyl, C 1-4 alkoxy, or C 1-4 haloalkyl, L 1 is a bond, O, S, SO 2, NH, N(C 1-4 alkyl), NHCO, N(C 1-4 alkyl)CO, NHCONH, N(C 1-4 alkyl)CONH, NHCON(C 1-4 alkyl), N(C 1-4 alkyl)CON(C 1-4 alkyl), CONH, CON(C 1-4 alkyl), SO 2 NH, or SO 2 N(C 1-4 akyl), L 2 is methylene, or ethylene, one of X 1 and X 2 is CH 2, and the other is N-CO-R', wherein R' is C 1-4 alkyl; C 2-4 alkenyl; or C 2-4 alkynyl, each of which is unsubstituted or substituted by one to three substituents each independently selected from the group consisting of halogen, cyano, hydroxy, amino, NH(C 1-4 alkyl), N(C 1-4 alkyl) 2, C 3-10 cycloalkyl, and C 3-10 heterocycloalkyl containing one or two heteroatoms each independently selected from the group consisting of nitrogen, and oxygen, and a and b are each independently represent an integer of 0 to 4.