[{"from": "human", "value": "What can you tell me about this molecule? [C][C][=C][C][=Branch2][Ring2][Branch1][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][N][C][=Branch1][C][=O][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][C][Branch1][C][C][Branch1][C][C][C][=Branch1][C][=O][O][C]"}, {"from": "gpt", "value": "The molecule is a synthetic small molecule with radiosensitizing activity.  Efaproxiral increases oxygen levels in hypoxic tumor tissues by binding non-covalently to the hemoglobin tetramer and decreasing hemoglobin-oxygen binding affinity.  Increasing tumor oxygenation reduces tumor radioresistance. (NCI04)"}]