| 摘要 |
The present invention relates to the field of pharmacy technology, concretely speaking, it relates to the compounds shown by formula (I), their pharmaceutically acceptable salts, their easily hydrolysable esters, their isomers, their hydrates, the hydrates of the above-said esters or salts, and the intermediates shown by formula (II), wherein R1, R2, R3, R4 and R5 are defined as that in the description. The present invention also relates to the preparation methods for these compounds and intermediates, the pharmaceutical compositions comprising these compounds and the use of these compounds in preparing the medicaments for treating and/ or preventing infective diseases. |
