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Peroxynitrite is the anion with the formula ONOO<sup>−</sup>. It is an unstable "valence isomer" of nitrate, NO<sub>3</sub><sup>-</sup>, which has the same formula but a different structure. Although peroxynitrous acid is highly reactive, its conjugate base peroxynitrite is stable in basic solution.[1] It is prepared by the reaction of hydrogen peroxide with nitrite: H<sub>2</sub>O<sub>2</sub> + NO<sub>2</sub><sup>-</sup> → ONOO<sup>-</sup> + H<sub>2</sub>O