(3R*,6S*,6aR*,9S*,9aS*)-6,6a,9-Trihydroxy-3,6,9a-trimethyl­perhydro­azuleno[1,2-b]furan-2-one

The title compound, C₁₅H₂₄O₅, was isolated from the flowers of Parthenium hysterophorus. The crystal structure determination confirms the relative stereochemistry unambiguously. The packing is stabilized by O—H...O hydrogen bonding.