The present invention refers to chemical compounds of formula (I), as well as pharmaceutically acceptable salts, esters and produgs thereof, wherein R1 to R5 have the significance given in claim 1. They can be used for the preparation of medicaments.
本发明涉及公式(I)的
化学化合物,以及药用可接受的盐、酯和前药,其中R1至R5的含义如权利要求1中所述。它们可用于制备药物。