6-Fluoro-4-oxochroman-2-carboxylic acid

The title compound, C10H7FO4, is an inter­mediate in the synthesis of the drug Fidarestat, (2S,4S)-2-aminoformyl-6-fluoro-spiro[chroman-4,4′-imidazolidine]-2′,5′-dione. The di­hydro­pyran­one ring adopts an envelope conformation with the asymmetric C atom in the flap position. In the crystal, the mol­ecules are linked into zigzag chains along [100] by O—H⋯O hydrogen bonds and C—H⋯π inter­actions involving the benzene ring.