Tetracyclic heterocycle compounds useful as HIV integrase inhibitors

A compound having the formula:

• or a pharmaceutically acceptable salt thereof,
• wherein:
• ----- represents an optional double bond;
• ring A, inclusive of the carbon atom and nitrogen atom to which ring A is fused, is a 5- to 8-membered monocyclic or bicyclic heterocycloalkyl group, which can be optionally and independently substituted on ring A carbon atom with a group selected from C1-C6 alkyl, —O—(C1-C6 alkyl) and C3-C7 cycloalkyl, and which can be optionally and independently substituted on a ring nitrogen atom with a group selected from C1-C6 alkyl, —C(O)—(C1-C6 alkyl) and —S(O)2—(C1-C6 alkyl);
• X is selected from 5 or 6-membered monocyclic heteroaryl and —N(R4)C(O)—;
• R1 is a phenyl group which is optionally substituted with from 1 to 3 groups, each independently selected from C1-C6 alkyl, halo, —O—(C1-C6 alkyl), C1-C6 haloalkyl, —O—(C1-C6 haloalkyl), —CN, —NO2, —N(R4)2, —C(O)OR6, —C(O)N(R4)2 and —NHC(O)R6;
• R2 is selected from H, C1-C6 alkyl, C3-C7 cycloalkyl, halo, C1-C6 haloalkyl, —OR5, —N(R4)2, —C(O)R5, —C(O)N(R4)2 and —NHC(O)R5, wherein said C1-C6 alkyl group is optionally substituted with one or more groups, each independently selected from halo, —OH, —O(C1-C6 alkyl) and —N(R4)2;
• R3 is selected from H, C1-C6 alkyl and —O—(C1-C6 alkyl), —N(R4)2;
• each occurrence of R4 is independently selected from H and C1-C6 alkyl;
• each occurrence of R5 is independently selected from H, C1-C6 alkyl and C3-C7 cycloalkyl;
• each occurrence of R6 is independently selected from H and C1-C6 alkyl;
• and
• R7 is selected from H and C1-C6 alkyl.