[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][=N][C][=C][Branch1][=N][N][Ring1][Branch1][C][O][C][Branch1][Ring1][C][O][C][O][N][=C][Branch1][=Branch1][N][C][Ring1][=C][=O][N]"}, {"from": "gpt", "value": "The molecule is a synthetic guanine derivative with antiviral activity.  As the active metabolite of ganciclovir, ganciclovir-5-triphosphate (ganciclovir-TP) appears to inhibit viral DNA synthesis by competitive inhibition of viral DNA polymerases and incorporation into viral DNA, resulting in eventual termination of viral DNA elongation."}]