The present invention relates to compounds represented by formula (I), or pharmaceutically acceptable prodrugs or salts thereof, or hydrates or solvates thereof,
(wherein,
R1, R2, R3, and R4 are the same as R1, R2, R3, and R4 in the description of the present invention).
本发明涉及由式(I)表示的化合物,其药学上可接受的前药或盐,或其
水合物或溶剂化物,其中,R1、R2、R3和R4与本发明说明中的R1、R2、R3和R4相同。