Abstract
In the title compound, C10H8O4, the almost planar coumarin ring system (r.m.s. deviation = 0.0216 Å from the plane through all 11 non-H atoms of the system) has hydroxymethyl and hydroxyl substituents at the 4- and 7-positions, respectively. In the crystal, two classical O—H...O hydrogen bonds generate a three-dimensional network structure.
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