| 摘要 |
This invention covers a compound of the formula <CHEM> wherein R is hydrogen, lower alkyl; X is hydrogen, halo, trifluoromethyl, lower alkyl or lower alkoxy; Y is lower alkyl or <CHEM> wherein Z is hydrogen, halo, methyl, methoxy or trifluoromethyl; and the wavy lines represent the alpha or beta configuration with the proviso that when one wavy line is alpha the other is beta , or a pharmaceutically accaptable, non-toxic salt of a compound of formula I wherein R is hydrogen. |
