[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is part of the group of diphosphines. Tetrofosmin is used in conjunction with technetium Tc-99m as a radiopharmaceutical."}, {"from": "gpt", "value": "[C][C][O][C][C][P][Branch1][=Branch1][C][C][O][C][C][C][C][P][Branch1][=Branch1][C][C][O][C][C][C][C][O][C][C]"}]