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The title compound, C 15 H 20 O 3 , crystallizes with two independent mol­ecules in the asymmetric unit. In both mol­ecules, the seven-membered ring adopts a chair conformation. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into chains extending in the [201] direction. The absolute configuration was assigned on the basis of the starting materials.

(5R,8R)-2-(3,8-Dimethyl-2-oxo-1,2,4,5,6,7,8,8a-octahydroazulen-5-yl)acrylic acid (rupestonic acid)