[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a contrast agent developed by Bracco with nonionic, low-osmolar properties."}, {"from": "gpt", "value": "[C][C@@H1][Branch2][Branch1][Ring2][C][=Branch1][C][=O][N][C][=C][Branch2][Ring2][=Branch2][C][=Branch2][Ring1][=Branch2][=C][Branch2][Ring1][Ring2][C][=Branch1][Branch1][=C][Ring1][=Branch1][I][C][=Branch1][C][=O][N][C][Branch1][Ring1][C][O][C][O][I][C][=Branch1][C][=O][N][C][Branch1][Ring1][C][O][C][O][I][O]"}]