Immunogenic trehalose compounds and uses thereof

A compound of formula (I),

• or a pharmaceutically acceptable salt thereof, wherein:
• R1 is selected from azido, alkynyl, and a five-membered heteroaryl ring having 1, 2, or 3 heteroatoms independently selected from N, O, and S, wherein the heteroaryl ring is optionally substituted with one substituent R3;
• R2 is selected from azido, alkynyl, and a five-membered heteroaryl ring having 1, 2, or 3 heteroatoms independently selected from N, O, and S, wherein the heteroaryl ring is optionally substituted with one substituent R4;
• wherein at least one of R1 and R2 is heteroaryl;
• R3 and R4 are each independently selected from Ar, alkyl, heteroalkyl, alkenyl, and heteroalkenyl;
• Ar is selected from an aryl or heteroaryl unsubstituted or substituted with one or more substituents independently selected from hydroxy, alkoxy, alkyl, and heteroalkyl;
• and
• each alkyl or heteroalkyl is independently unsubstituted or substituted with one or more substituents independently selected from hydroxy, amino, oxo, thioxo, halo, and haloalkyl.