[{"from": "human", "value": "Describe 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 nucleoside analogue and antiviral agent used in therapy of herpes zoster and simplex virus infections. Famciclovir is associated with a low rate of mild-to-moderate serum ALT elevations during therapy, but has not been associated with instances of clinically apparent liver injury."}]