[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. 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."}, {"from": "gpt", "value": "[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]"}]