The invention provides a compound of formula I:
or a salt thereof, wherein R
1
, R
2
, R
3
, A and n have any of the values described in the specification, as well as compositions comprising a compound of formula I, and methods of preparing and use thereof. The compounds are useful as vaccine adjuvant potentiators.
该发明提供了化合物I的
化学式,或其盐,其中R1、R2、R3、A和n具有规范中描述的任何值,以及包含化合物I的组合物,以及其制备和使用方法。这些化合物可用作疫苗佐剂增强剂。