A compound of formula (I) wherein R
1
, R
2
, R
3
and R
4
are as defined in the specification, processes for their production, their uses, in particular in transplantation, and pharmaceutical compositions containing them.
化合物的
化学式为(I),其中R1,R2,R3和R4如规范中所定义,包括其生产过程,尤其是在移植中的用途以及含有它们的制药组合物。