[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][C][Ring1][Ring1][N][C][=C][C][=Branch1][=Branch2][=N][C][=Branch1][Ring2][=N][Ring1][=Branch1][N][N][Branch1][Branch1][C][=N][Ring1][=Branch2][C@@H1][C][C@@H1][Branch1][Branch1][C][=C][Ring1][Branch1][C][O]"}, {"from": "gpt", "value": "The molecule is a powerful nucleoside analog reverse transcriptase inhibitor (NRTI) used to treat HIV and AIDS. Chemically, it is a synthetic carbocyclic nucleoside and is the enantiomer with 1S, 4R absolute configuration on the cyclopentene ring. In vivo, abacavir sulfate dissociates to its free base, abacavir."}]