abstract |
The present invention provides compounds useful for treating HIV infection, for preventing HIV infection, or for treating AIDS or ARC. The compounds of the invention are of the formula (I), wherein R 1 , R 2 , R 3 , R 4 , X 1 and X 2 are as defined herein. Also disclosed in the present invention is a method of treating HIV infection with a compound as defined herein and a pharmaceutical composition containing the compound. |