[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a gadolinium coordination entity. It has a role as a MRI contrast agent."}, {"from": "gpt", "value": "[C][Branch1][P][C][N][Branch1][#Branch1][C][C][=Branch1][C][=O][O][C][C][=Branch1][C][=O][O-1][N][Branch2][Ring1][C][C][C][N][Branch1][#Branch1][C][C][=Branch1][C][=O][O][C][C][=Branch1][C][=O][O-1][C][C][=Branch1][C][=O][O-1].[Gd+3]"}]