abstract |
The present invention provides compounds of the Formula I: n nwherein R 1 is alkyl, cycloalkyl, cycloallkylalkyl, or —CH 2 -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. |