The invention provides novel compounds of formula (I)
or a pharmaceutically acceptable salt thereof, wherein R1 to R7 are as described herein, compositions including the compounds and methods of preparing and using the compounds.
The invention provides novel compounds of formula (I)
or a pharmaceutically acceptable salt thereof, wherein R
1
to R
7
are as described herein, compositions including the compounds and methods of preparing and using the compounds.
A compound of formula (I) or a pharmaceutically acceptable salt thereof, wherein R1 to R7 have the significance given in claim 1, can be used in the form of a pharmaceutical composition.