[{"from": "human", "value": "Provide a description of this molecule. [C][=N][C][=Branch2][Ring1][O][=C][C][=Branch1][Ring2][=N][Ring1][=Branch1][N][Branch1][Branch1][C][=N][Ring1][=Branch1][C][C][O][C][P][=Branch1][C][=O][Branch1][C][O][O][N]"}, {"from": "gpt", "value": "The molecule is an acyclic nucleotide analogue of adenosine used either alone or in combination with other agents as therapy of chronic hepatitis B. Adefovir does not appear to be a significant cause of drug induced liver injury, but initiation of therapy and sudden withdrawal of therapy can induce a transient exacerbation of the underlying hepatitis B."}]