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The title compound, C 15 H 20 O 3 , a sesquiterpene lactone, was isolated from the aerial parts of  Carpesium minus  Hemsl. (Compositae). The mol­ecule is composed of three rings, with the two cyclo­hexane rings in chair conformations and the cyclo­pentane ring adopting a twist conformation. The  A / B  ring junction is  trans -fused. The absolute configuration shown has been arbitrarily assigned. In the crystal, mol­ecules are linked into [100] chains by O—H⋯O hydrogen bonds.

5α-Hydroxyeudesm-4(15),11(13)-dien-8β,12-olide