| abstract |
Compounds of formula (I), compositions, methods and kits are provided. The compounds and compositions may be particularly useful for modulating immunological responses. Formula (I) wherein, R 1 is alkyl, aryl, or heterocyclyl; R 2 is H, alkyl, aryl, heterocyclyl, OR 3 or N(R 3 ) 2 , R 3 is H, alkyl, aryl, or heterocyclyl; R 4 is H, CN, halogen, CF 3 , CO 2 R 3 , or C(O)N(R 3 ) 2 ; X is S, SO 2 , O, or NR 3 ; and Y is S, O, or NR 3 . |