The present invention provides compounds for treating or preventing an HIV infection, or treating AIDS or ARC comprising administering a compound according to formula I where Ar, R
1
-R
5
, R
7a
, R
7b
, R
7c
, R
8
-R
10
, X
1
, X
2
m, n, o and p are as defined herein.
Compounds of formula I, wherein R
1
, R
2
, R
3
, X
1
, X
2
and Ar, are as defined herein or pharmaceutically acceptable salts thereof, inhibit HIV-1 reverse transcriptase and afford a method for prevention and treatment of HIV-1 infections and the treatment of AIDS and/or ARC. The present invention also relates to compositions containing compounds of formula I useful for the prevention and treatment of HIV-
1
infections and the treatment of AIDS and/or ARC.