[{"from": "human", "value": "Please give me some details about this molecule. [O-1][Se][=Branch1][C][=O][=Branch1][C][=O][O-1].[Na+1].[Na+1]"}, {"from": "gpt", "value": "The molecule is the sodium salt of selenium.  As a trace mineral that is toxic in high doses, selenium is a cofactor for glutathione peroxidase, an anti-oxidant enzyme that neutralizes hydrogen peroxide.  Selenium may be chemoprotective for certain cancers, particularly prostate cancer.  High dietary supplementation with sodium selenate may inhibit the progression of hormone-refractory prostate cancer due, in part, to an antiangiogenesis effect. (NCI04)"}]