[{"from": "human", "value": "Describe this molecule. [C][C][Branch1][C][C][C@@H1][Branch2][Ring1][O][C][=Branch1][C][=O][O][C][C][O][C][N][C][=N][C][=C][Ring1][Branch1][N][=C][Branch1][=Branch1][N][C][Ring1][=Branch1][=O][N][N]"}, {"from": "gpt", "value": "The molecule is a nucleoside analogue antiviral agent and prodrug of acyclovir which is used in therapy of herpes simplex and varicella-zoster virus infections. Valacyclovir has been associated with rare instances mild, clinically apparent liver injury."}]