[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a 2',7'-bis-(2-carboxyethyl)carboxyfluorescein compound having a carboxy substituent in the 5-position. It has a role as a fluorochrome. It is functionally related to a fluorescein (acid form)."}, {"from": "gpt", "value": "[C][=C][C][=Branch2][Ring1][C][=C][Branch1][#Branch2][C][=C][Ring1][=Branch1][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O][C][=C][C][=C][Branch2][Ring1][S][C][=Branch1][C][=O][C][=C][Ring1][#Branch1][O][C][=C][Ring1][O][C][=C][Branch1][Branch2][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C][C][C][=Branch1][C][=O][O][C][C][C][=Branch1][C][=O][O]"}]