A compound of Formula or a tautomer or a stereoisomeric form thereof, wherein R 1, R 2 and R 3 are independently selected from the group consisting of hydrogen, fluoro, cyano, C 1-3 alkyl, mono- and polyhalo-C 1-3 alkyl, and C 3-6 cycloalkyl; R 4 is fluoro or trifluoromethyl; or R 1 and R 2, or R 3 and R 4 taken together with the carbon atom to which they are attached may form a C 3-6 cycloalkanediyl ring; R 5 is selected from the group consisting of hydrogen, C 1-3 alkyl, cyclopropyl, mono- and polyhalo-C 1-3 alkyl, homoaryl and heteroaryl; X 1, X 2, X 3, X 4 are independently C(R 6) or N, provided that no more than two thereof represent N; each R 6 is selected from the group consisting of hydrogen, halo, C 1-3 alkyl, mono- and polyhalo-C 1-3 alkyl, cyano, C 1-3 alkyloxy, mono- and polyhalo-C 1-3 alkyloxy; L is a bond or -N(R 7)CO-, wherein R 7 is hydrogen or C 1-3 alkyl; Ar is homoaryl or heteroaryl; homoaryl is phenyl or phenyl substituted with one, two or three substituents selected from the group consisting of halo, cyano, C 1-3 alkyl, C 1-3 alkyloxy, mono-and polyhalo-C 1-3 alkyl, mono- and polyhalo-C 1-3 alkyloxy; heteroaryl is selected from the group consisting of pyridyl, pyrimidyl, pyrazyl, pyridazyl, furanyl, thienyl, pyrrolyl, pyrazolyl, imidazolyl, triazolyl, tetrazolyl, thiazolyl, isothiazolyl, thiadiazolyl, oxazolyl, isoxazolyl and oxadiazolyl, each optionally substituted with one, two or three substituents selected from the group consisting of halo, cyano, C 1-3 alkyl, C 2-3 alkynyl, C 1-3 alkyloxy, mono- and polyhalo-C 1-3 alkyl, mono- and polyhalo-C 1-3 alkyloxy, and C 1-3 alkyloxy-C 1-3 alkyloxy; or an addition salt or a solvate thereof. R 1, R 2 and R 3 are independently selected from the group consisting of hydrogen, fluoro, cyano, C 1-3 alkyl, mono- and polyhalo-C 1-3 alkyl, and C 3-6 cycloalkyl; R 4 is fluoro or trifluoromethyl; or R 1 and R 2, or R 3 and R 4 taken together with the carbon atom to which they are attached may form a C 3-6 cycloalkanediyl ring; R 5 is selected from the group consisting of hydrogen, C 1-3 alkyl, cyclopropyl, mono- and polyhalo-C 1-3 alkyl, homoaryl and heteroaryl; X 1, X 2, X 3, X 4 are independently C(R 6) or N, provided that no more than two thereof represent N; each R 6 is selected from the group consisting of hydrogen, halo, C 1-3 alkyl, mono- and polyhalo-C 1-3 alkyl, cyano, C 1-3 alkyloxy, mono- and polyhalo-C 1-3 alkyloxy; L is a bond or -N(R 7)CO-, wherein R 7 is hydrogen or C 1-3 alkyl; Ar is homoaryl or heteroaryl; homoaryl is phenyl or phenyl substituted with one, two or three substituents selected from the group consisting of halo, cyano, C 1-3 alkyl, C 1-3 alkyloxy, mono-and polyhalo-C 1-3 alkyl, mono- and polyhalo-C 1-3 alkyloxy; heteroaryl is selected from the group consisting of pyridyl, pyrimidyl, pyrazyl, pyridazyl, furanyl, thienyl, pyrrolyl, pyrazolyl, imidazolyl, triazolyl, tetrazolyl, thiazolyl, isothiazolyl, thiadiazolyl, oxazolyl, isoxazolyl and oxadiazolyl, each optionally substituted with one, two or three substituents selected from the group consisting of halo, cyano, C 1-3 alkyl, C 2-3 alkynyl, C 1-3 alkyloxy, mono- and polyhalo-C 1-3 alkyl, mono- and polyhalo-C 1-3 alkyloxy, and C 1-3 alkyloxy-C 1-3 alkyloxy; or an addition salt or a solvate thereof.