[{"from": "human", "value": "Please give me some details about this molecule. [C][C][=Branch1][C][=O][O][C][C][Branch2][Ring1][Ring1][C][C][N][C][=N][C][=C][N][=C][Branch1][#Branch1][N][=C][Ring1][=Branch1][Ring1][=Branch2][N][C][O][C][=Branch1][C][=O][C]"}, {"from": "gpt", "value": "The molecule is a diacetyl 6-deoxy prodrug analog of the antiviral agent penciclovir.  Orally administered, famciclovir in vivo is converted to penciclovir triphosphate, which is active against the Herpes viruses, including herpes simplex 1 and 2 and varicella-zoster.  This agent inhibits the replication of viral DNA by interfering competitively with DNA polymerase. (NCI04)"}]