| 摘要 |
The present invention provides compounds of Formula (I), wherein R1 is alkyl , cycloalkyl, cycloakylalkyl, or -CH2-alkenyl, X1 is O, NH, N(alkyl), S or - C(=O), Z is N or CH; and R2 and R3 are as defined herein, pharmaceutical compositions comprising same, and methods for their use.
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