The present invention refers to chemical compounds of formula (I)
as well as pharmaceutically acceptable salts and esters thereof, wherein R
1
to R
5
have the significance given in claim 1. These compounds can be used for the preparation of medicaments.
本发明涉及
化学式(I)的化合物,以及其药学上可接受的盐和酯,其中R1至R5具有权利要求1中给出的含义。这些化合物可用于制备药物。