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The title compound, C11H13NO6, exhibits an intra­molecular O–H...O=C hydrogen bond between the N-hydroxyl H atom and carbonyl O atom of the neighboring acetyl group. This finding contradicts a previously published model in which the hydrogen bond was postulated to occur with the neighboring carbomethoxy group. This relatively strong hydrogen bond [O—H...O: D = 2.5583 (11) Å and θ = 152°] may underlie the resistance of the title compound to oxidation into the corresponding nitroxide.

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The title salt crystallized with two anions and two cations in the asymmetric unit, together with three water mol­ecules. In the crystal, the anions are linked via O—H...O hydrogen bonds, involving the water mol­ecules, forming chains along [100] and the cations are linked to these chains by N—H...O hydrogen bonds.
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