[{"from": "human", "value": "Provide a brief overview of this molecule. [C][O][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][S][C][=N][C][=Branch2][Ring2][=Branch2][=N][C][=C][Ring1][=Branch1][N][=C][N][Ring1][Branch1][C][C][O][C][P][=Branch1][C][=O][Branch1][O][O][C][C][Branch1][C][F][Branch1][C][F][F][O][C][C][Branch1][C][F][Branch1][C][F][F][N]"}, {"from": "gpt", "value": "The molecule is a purine nucleotide analog prodrug with activity against wild-type and lamivudine-resistant hepatitis B virus (HBV). Alamifovir acts by inhibiting viral DNA priming and viral DNA packaging, thereby decreasing HBV replication."}]