[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a Radioactive Diagnostic Agent. The mechanism of action of technetium tc-99m pyrophosphate is as a Radiopharmaceutical Activity."}, {"from": "gpt", "value": "[O-1][P][=Branch1][C][=O][Branch1][C][O-1][O][P][=Branch1][C][=O][Branch1][C][O-1][O-1].[99Tc]"}]