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The title compound, C 21 H 30 O 6 , a natural  ent -kaurane diterpenoid, was obtained from the medicinal plant  Isodon serra . The five rings in the mol­ecule exhibit the expected  cis  and  trans  junctions. The three six-membered rings adopt chair, twist-boat and boat conformations, while two five-membered rings adopt envelope conformations. There are two mol­ecules in the asymmetric unit, related by a non-crystallographic twofold screw axis; the main difference is in the different degrees of distortion of ring  B . In the crystal, the mol­ecules are linked by inter­molecular O—H⋯O hydrogen bonds, forming chains along the  b  axis.

15α,20β-Dihydroxy-6β-methoxy-6,7-seco-6,20-epoxy-1,7-olide-ent-kaur-16-ene