The invention relates to compounds of structural formula (I): or a pharmaceutically acceptable salt, solvate, clathrate, or prodrug thereof, wherein A, L, Y, W<;SUB>;1<;/SUB>;, W<;SUB>;2<;/SUB>;, Z, X, X<;SUB>;2<;/SUB>;, and n are defined herein. These compounds are useful as immunosuppressive agents and for treating and preventing inflammatory conditions, allergic disorders, and immune disorders.