| 摘要 |
The present invention provides compounds of the Formula I: wherein R<1 >is alkyl, cycloalkyl, cycloalkylalkyl, or -CH2-alkenyl, X<1 >is O, NH, N(alkyl), S or -C(=O), Z is N or CH; and R<2 >and R<3 >are as defined herein, pharmaceutical compositions comprising same, and methods for their use.
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