[{"from": "human", "value": "Describe this molecule. [C][C][C][N][Branch1][Branch1][C][C][Ring1][=Branch1][C][C][Branch1][=C][C][N][C][=C][N][=C][Ring1][Branch1][N+1][=Branch1][C][=O][O-1][O].[Cl]"}, {"from": "gpt", "value": "The molecule is the hydrochloride salt form of pimonidazole, a hypoxia-selective 2-nitroimidazole with potential radiosensitizing activity. Pimonidazole is reduced in hypoxic environments such as those found in tumors. In hypoxic cells and tumors, reduced pimonidazole binds to thiol-containing proteins and glutathione. The resulting complexes accumulate in hypoxic tumors, deplete radioprotective thiol compounds, and cause the tumor to be more susceptible to radiation treatment."}]