| 摘要 |
The present invention is directed compositions of the formula: <IMAGE> (I) wherein: D is a biologically active moiety; X is an electron withdrawing group; Y and Y' are independently O or S; R1 is selected from the group consisting of H, C1-6 alkyls, aryls, substituted aryls, aralkyls, heteroalkyls, substituted heteroalkyls and substituted C1-6 alkyls; (n) is an integer from 1 to about 12; and R2 is a polyalkylene oxide. In preferred embodiments, the prodrugs contain a polyethylene glycol having a molecular weight of at least about 20,000.
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