Pyrazolopyrimidine compound, pharmaceutical composition, and application therefor

A pyrazolopyrimidine compound having a structure represented by formula (I), or a pharmaceutically acceptable salt thereof, or a stereoisomer, a geometric isomer, a tautomer, a nitrogen oxide, a hydrate, a solvate, a metabolite, or a prodrug thereof,

• wherein in the formula (I)
• R1, R2, R3 and R4 are each independently selected from H, halogen, C1-12 alkyl, C1-12 alkyl substituted by 1-6 halogen;
• R5 is selected from H, C1-12 alkyl, C1-12 alkyl substituted by 1-6 halogens, C1-12 alkyl substituted by hydroxy, C2-12 alkyl substituted by alkoxy, C2-12 alkyl substituted by cyano, and C2-12 cycloalkyl containing 1-3 heteroatoms selected from N, O and S;
• R6 is selected from the group consisting of H, C1-12 alkyl, C1-12 alkyl substituted by hydroxy, halogen;
• R7 is selected from H, C1-12 alkyl, C1-12 alkyl substituted by 1-6 halogens, C1-12 alkyl substituted by hydroxy, C2-12 alkyl substituted by cyano, C2-12 cycloalkyl containing 1-3 hetero atoms selected from N, O and S, C2-12 acyl, sulfonyl.