A compound of Formula 3a or 3b or pharmaceutically acceptable salts thereof: wherein R 1a to R 1d are each independently hydrogen, a halogen, C 1-6 alkyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 alkoxy, C 1-6 haloalkoxy, C 2-10 alkenyl, C 2-10 haloalkenyl, C 2-10 alkynyl, C 2-10 haloalkynyl, a hydroxyl group, nitro, cyano, C 1-6 alkoxycarbonyl, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, amino(C 1-6)alkyl, (C 1-6)alkylamino(C 1-6)alkyl, C 1-6 alkanoyl, C 3-7 cycloalkyl, an aryl, a heterocycle, or a heteroaryl, wherein R 1a to R 1d are each independently unsubstituted or optionally substituted; R 3 is C 1-4 alkyl, isoalkyl, cycloalkyl, phenyl, or C 1-4 haloalkyl; n is 1 or 2; R 4a and R 4b are each independently hydrogen, a halogen, C 1-4 alkyl, C 1-4 haloalkyl, or C 1-4 alkyl in which one or more hydrogens are substituted with substituents other than halogen; Ar is phenyl, heteroaryl being 5-6-membered and having heteroatoms selected independently from N, S, or O, or biheteroaryl being 8-12-membered and having heteroatoms selected independently from N, S, or O, wherein Ar may be unsubstituted or may be optionally substituted with one or more of a halogen, C 1-6 alkyl, C 1-6 alkylthio, C 1-6 haloalkyl, C 1-6 haloalkylthio, C 1-6 alkoxy, C 1-6 haloalkoxy, C 2-10 alkenyl, C 2-10 haloalkenyl, C 2-10 alkynyl, C 2-10 haloalkynyl, a hydroxyl group, COOH, nitro, cyano, C 1-6 alkoxycarbonyl, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, amino(C 1-6)alkyl, (C 1-6)alkylamino(C 1-6)alkyl, (C 1-6)alkoxy(C 1-6)alkylamino, (C 1-6)alkylamino(C 1-6) alkylamino, C 1-6 alkanoyl, SF 5, S CF 3, SCF 3, NHC(=O)CH 3, C(=O)NHCH 3, NHSO2CH3, C 3-7 cycloalkyl, an aryl, benzoyl, a heterocycle, a heteroaryl, phenyl, oxazole, pyrazole, pyrrole, imidazole, thiazole, thiophene, pyridine, pyrimidine, furan, indole, benzopyrazole, benzothiazole, benzooxazole, isoxazole, benzoimidazole, or benzothiophene, and wherein the substituents of Ar may be unsubstituted or may be optionally substituted with one or more of CF 3, a halogen, (C 1-3)alkyl, (C 1-3)haloalkyl, hydrogen, COOH, nitro, cyano, amino, di(C 1-3 alkyl)amino, NHC(=O)CH 3, or C(=O)NHCH 3. R 1a to R 1d are each independently hydrogen, a halogen, C 1-6 alkyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 alkoxy, C 1-6 haloalkoxy, C 2-10 alkenyl, C 2-10 haloalkenyl, C 2-10 alkynyl, C 2-10 haloalkynyl, a hydroxyl group, nitro, cyano, C 1-6 alkoxycarbonyl, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, amino(C 1-6)alkyl, (C 1-6)alkylamino(C 1-6)alkyl, C 1-6 alkanoyl, C 3-7 cycloalkyl, an aryl, a heterocycle, or a heteroaryl, wherein R 1a to R 1d are each independently unsubstituted or optionally substituted; R 3 is C 1-4 alkyl, isoalkyl, cycloalkyl, phenyl, or C 1-4 haloalkyl; n is 1 or 2; R 4a and R 4b are each independently hydrogen, a halogen, C 1-4 alkyl, C 1-4 haloalkyl, or C 1-4 alkyl in which one or more hydrogens are substituted with substituents other than halogen; Ar is phenyl, heteroaryl being 5-6-membered and having heteroatoms selected independently from N, S, or O, or biheteroaryl being 8-12-membered and having heteroatoms selected independently from N, S, or O, wherein Ar may be unsubstituted or may be optionally substituted with one or more of a halogen, C 1-6 alkyl, C 1-6 alkylthio, C 1-6 haloalkyl, C 1-6 haloalkylthio, C 1-6 alkoxy, C 1-6 haloalkoxy, C 2-10 alkenyl, C 2-10 haloalkenyl, C 2-10 alkynyl, C 2-10 haloalkynyl, a hydroxyl group, COOH, nitro, cyano, C 1-6 alkoxycarbonyl, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, amino(C 1-6)alkyl, (C 1-6)alkylamino(C 1-6)alkyl, (C 1-6)alkoxy(C 1-6)alkylamino, (C 1-6)alkylamino(C 1-6) alkylamino, C 1-6 alkanoyl, SF 5, S CF 3, SCF 3, NHC(=O)CH 3, C(=O)NHCH 3, NHSO2CH3, C 3-7 cycloalkyl, an aryl, benzoyl, a heterocycle, a heteroaryl, phenyl, oxazole, pyrazole, pyrrole, imidazole, thiazole, thiophene, pyridine, pyrimidine, furan, indole, benzopyrazole, benzothiazole, benzooxazole, isoxazole, benzoimidazole, or benzothiophene, and