A compound having the Formula (I) or a stereoisomer, a geometric isomer, a tautomer, a racemate, an N-oxide, a hydrate, a solvate or a pharmaceutically acceptable salt thereof, ** Formula ** in which each one of R1, R2 and R3 is -OH； where R6 is -OR6a or -OC (>； = O) R6b； and R4 is independently -H, alkyl, alkylamino, alkynyl, alkenyl or cyano, and where optionally each of alkyl, alkylamino, alkynyl and alkenyl is substituted with one or more substituents independently selected from -F, -Cl, -Br, -I, hydroxy, cyano, amino, alkynyl, alkenyl, carboxy, mercapto, alkylamino and trifluoromethyl； and R5 is independently alkyl, alkylamino, alkynyl, alkenyl or cyano, and wherein optionally each of alkyl, alkylamino, alkynyl and alkenyl is substituted with one or more substituents independently selected from -F, -Cl, -Br, -I, hydroxy, cyano, amino, alkynyl, alkenyl, carboxy, mercapto, alkylamino and trifluoromethyl； or R4 and R5, together with the carbon atom to which they are attached, form a ring A, where ring A is a saturated or unsaturated 3 to 8 member ring, and where ring A optionally contains one or more atoms or atomic groups independently selected from -NH-, -O-, -S-, -C (>； = O) - and -S (>； = O) -, and where ring A is optionally substituted with one or more substituents independently selected from -F, -Cl, -Br and -I； or in which R4 is -H； and R5 and R6, together with the carbon atom to which they are attached, form a ring B, where ring B is a 3 to 8 member ring, saturated or unsaturated, and where ring B optionally contains one or more atoms or atomic groups independently selected from -NH-, -O-, -S-, -C (>； = O) - and -S (>； = O) -, and where ring B is optionally substituted with one or more substituents independently selected from -F, -Cl, -Br and -I； wherein R 6a is -H, alkyl, cycloalkyl, heterocyclyl, aryl, heteroaryl, arylalkyl or heteroarylalkyl, and wherein optionally each of alkyl, cycloalkyl, heterocyclyl, aryl, heteroaryl, arylalkyl and hetero
