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The title compound, C9H3F5O2, crystallizes as O—H...O hydrogen-bonded carb­oxy­lic acid dimers that, together with C—H...F inter­actions and O...F [2.8065 (13) and 2.9628 (13) Å] and F...F [2.6665 (11), 2.7049 (12) and 2.7314 (12) Å] contacts, form a sheet-like structure. The sheets are stacked via short π–π inter­actions [centroid–centroid distance = 4.3198 (11) Å]. An intra­molecular C—H...F inter­action is also observed.
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