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Relative stability of the radical anions obtained by H-atom abstraction from deprotonated quercetin, calculated in the gas phase (A) and in water (B), determined from the relative energy (Erel) with reference to the most stable species (ref = 0). Numbers on the x-axis indicate the position of the radical and of the negative charge. The radical anion in 5-7 is omitted for clarity (Erel is 32.7 and 21.0 kcal/mol in the gas phase and water, respectively).
