The present invention is directed to compounds represented by the following structural formula, Formula I: and stereoisomers, pharmaceutically acceptable salts, solvates and hydrates thereof, wherein: (a) X is selected from the group consisting of O, S, S(O)2, N, and a bond; (b) U is an aliphatic linker wherein one carbon atom of the aliphatic linker may be replaced with O, NH or S, and wherein such aliphatic linker is optionally substituted with R30: (c) Y is selected from the group consisting of C, O, S, NH and a single bond; and (d) E is C(R3)(R4)A or A.
本发明涉及以下结构式I所表示的化合物,以及其立体异构体、药学上可接受的盐、溶剂合物和
水合物,其中:(a) X选择自O、S、S(O)2、N和一个键的群组;(b) U是脂肪链连接剂,其中脂肪链连接剂的一个碳原子可以被O、NH或S替换,且该脂肪链连接剂可以选择性地被R30取代:(c) Y选择自C、O、S、NH和单键的群组;(d) E是C(R3)(R4)A或A。