[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is major microspecies at pH 7.3. It is a conjugate base of an isoechinulin B."}, {"from": "gpt", "value": "[C][C][=Branch2][Ring2][S][=C][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N][C][=Branch2][Ring1][=Branch1][=C][Ring1][#Branch1][/C][=C][\\C][=Branch1][C][=O][N][C][=Branch1][C][=C][C][=Branch1][Ring2][=N][/-Ring1][Branch2][O-1][C][Branch1][C][C][Branch1][C][C][C][=C][C]"}]