The invention relates to compounds of structural formula (I):or a pharmaceutically acceptable salt, solvate, clathrate, or prodrug thereof, wherein A, L, Y, W1, W2, Z, X, X2, and n are defined herein. These compounds are useful as immunosuppressive agents and for treating and preventing inflammatory conditions, allergic disorders, and immune disorders.本發明係有關結構式(I)之化合物:或其醫藥上可接受之鹽、溶劑合物、籠形包合物(clathrate)或前藥,其中,A、L、Y、W1、W2、Z、X、X2與n如本文中定義。此等化合物適用為免疫抑制劑,供治療及預防炎症、過敏性失調(allergic disorder)與免疫失調(immune disorder)。