Source:http://linkedlifedata.com/resource/umls/id/C0071072
NCI: A 2-nitroimidazole with hypoxic selectivity and potential radiosensitizing activities. Pimonidazole is reduced in hypoxic environments such as those found in tumors. In hypoxic cells, reduced pimonidazole binds to thiol-containing proteins. The resulting complexes accumulate in hypoxic tumors, thereby depleting radioprotective thiol compounds and sensitizing tumor cells to be more susceptible for radiation treatment.