Use as nitrogen-containing fused ring compound and hiv integrase inhibitors

The present invention has the following general formula [I] (Wherein each symbol is as defined in the description.) Relates to an anti-HIV agent comprising a nitrogen-containing fused ring compound represented by or a pharmaceutically acceptable salt thereof, and their compounds. The compounds of the present invention has an effect of inhibiting the HIV integrase activity, as an anti-HIV agent are useful as AIDS therapeutic agent or prophylactic agent. Moreover, protease inhibitors, the combination with other anti-HIV agents such as reverse transcriptase inhibitors, can be a more effective anti-HIV agents. Also, it has a high inhibitory activity specific for integrase can be a safe fewer side effects drug to the human body.