| abstract |
The present invention relates to fused tricyclic heterocyclic compounds of formula (I) and pharmaceutically acceptable salts thereof, wherein R 1, R 2 and R 3 are as defined herein. The invention also relates to compositions comprising at least one fused tricyclic heterocyclic compound and methods of using the fused tricyclic heterocyclic compound to treat or prevent HIV infection in a subject. [Chemical 1] |