The invention relates to compounds of formula I:
wherein R1, R2,Ra, Rb, X have the meanings given in claim 16. The compounds are useful e.g. in the treatment of autoimmune disorders, such as multiple sclerosis.
The invention relates to compounds of formula I:
wherein R
1
, R
2
, R
a
, R
b
, X have the meanings given in claim
16
. The compounds are useful e.g. in the treatment of autoimmune disorders, such as multiple sclerosis.