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Proposed strained 4-membered ring structure of peroxynitrite anion, its protonation, and proposed spin-conserved decomposition of peroxynitrous acid at pH 7, thus generating the transient reactants, ground state 1HNO, and electronically excited 1O2. The NO−, formed by the deprotonation of 1HNO, is trapped by MetHb to form nirosylhemoglobin (HbNO). The 1O2 formed was trapped by diphenylanthracene (DPA) to form the stable (at room temperature) endoperoxide DPAO2.
