A compound of formula (I): ** (See formula) ** and / or a pharmaceutically acceptable salt thereof, and / or its solvates, racemic mixture, enantiomers, diastereomers, and tautomers, in which Ar is aryl, said aryl is a carbocyclic hydrocarbon radical of a monocyclic ring or fused rings containing 6-12 ring carbon atoms, in which at least one ring is aromatic and none of the other rings is heteroaryl； or heteroaryl, said heteroaryl is a monocyclic aromatic hydrocarbon radical having 5, 6 or 7 ring atoms, and containing 1 or 2 heteroatoms independently chosen from N, O, and S in the ring, the remaining ring atoms being carbon； or a bicyclic aromatic hydrocarbon radical having 9 or 10 ring atoms, and containing 1, 2, 3 or 4 heteroatoms independently chosen from N, O, and S in the rings, the remaining ring atoms being carbon, in which at least one of the rings is aromatic； when the total number of S and O atoms in the heteroaryl group exceeds 1, those heteroatoms are not adjacent to each other, and said heteroaryl group also includes those in which the N heteroatom appears as Noxide； each of said aryl and heteroaryl is optionally substituted with one or more groups selected from deuterium, halo, -CN, -OH, -SH, C1-6 alkyl, C1-6 haloalkyl, - (C1-6 alkyl) OH , and -S (O) 2 (C1-6 alkyl)； W is chosen from heteroaryl and -N (R3) heteroaryl, wherein said heteroaryl is a nitrogen-containing monocyclic aromatic hydrocarbon radical having 5, 6, or 7 ring atoms, and containing 1 or 2 heteroatoms, wherein the heteroatom or heteroatoms are nitrogen atoms, the remaining ring atoms being carbon； or a nitrogen-containing bicyclic aromatic hydrocarbon radical having 9 or 10 ring atoms, and containing 1, 2, 3, or 4 heteroatoms, wherein the heteroatom or heteroatoms are nitrogen atoms, the remaining ring atoms being carbon, in the that at least one of the rings is aromatic； and said heteroaryl group also includes those in which the N heteroatom appears as N-oxide, and said heteroaryl is o
