A compound of formula (I)
wherein R, R
1
, and R
2
, ring A and ring B are as defined in the specification, processes for their production, their uses, in particular in transplantation, and pharmaceutical compositions containing them.
A compound of formula (I), wherein R, R
1
, R
2
, ring A, which ring contains one or two nitrogen atoms, and ring B are as defined in the Specification, pharmaceutical compositions containing these compounds, and uses for these compounds and compositions, in particular, in transplantation.