[{"from": "human", "value": "Describe this molecule. [C][C][Branch1][C][C][C@@H1][Branch2][Ring1][#C][C][=Branch1][C][=O][O][C][C][Branch1][Ring1][C][O][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 an antiviral medication used to treat cytomegalovirus infections. As the L-valyl ester of ganciclovir, it is actually a prodrug for ganciclovir. After oral administration, it is rapidly converted to ganciclovir by intestinal and hepatic esterases."}]