A compound of formula (I)
as well as pharmaceutically acceptable salt thereof, wherein R1 to R5 have the significance given in claim 1, can be used as a medicament.
公式(I)的化合物及其药学上可接受的盐,其中R1至R5具有权利要求1所述的含义,可用作药物。
Khairullin, V.N.; Pudovik, A.N., Russian Journal of General Chemistry, 1994, vol. 64, # 5.1, p. 675 - 677