Compounds of Formula I: and salts thereof in which R
1
, R
2
, R
2a
, R
3
, n, X and ring B have the meanings given in the specification, are inhibitors of mTOR and are useful in the treatment of diseases which are sensitive to inhibition of mTOR, such as cancers.
式I的化合物及其盐,其中R1、R2、R2a、R3、n、X和环B具有规范中所给出的含义,是mTOR的
抑制剂,可用于治疗对mTOR抑制敏感的疾病,如癌症。