()-2,5-Dioxoper­hydro­cyclo­octa­[b]­furan-3-carboxyl­ic acid

The anti stereochemistry between the fused rings of the bicyclic lactone ()-2,5-dioxoper­hydro­cyclo­octa­[b]­furan-3-carboxyl­ic acid, C₁₁H₁₄O₅, has been established. Intermolec­ular hydrogen bonds are observed between the carboxyl­ic acid group and the carbonyl O atom of an adjacent mol­ecule.