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In the title compound, C15H10O5, the cyclo­penta­none (r.m.s. deviation = 0.049 Å) and oxolane (r.m.s. deviation = 0.048 Å) rings make a dihedral angle of 67.91 (4)°. An intra­molecular O—H...O hydrogen bond is observed. In the crystal, mol­ecules associate via O—H...O hydrogen bonds, forming a three-dimensional network.

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In the title compound, C9H13N2O+·Cl, the cation, apart from the methyl groups, is almost planar, with a maximum deviation of 0.040 (1) Å; the methyl C atoms deviate by 0.389 (2) and −1.247 (1) Å, from the mean plane. In the crystal, cations and anions associate through C—H...Cl hydrogen bonds, forming a helical arrangement. In addition, inter­molecular O—H...Cl, N—H...Cl and C—H...N inter­actions are observed.
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