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The title compound, systematic name 9-isopropyl­idene-2,6-dimethyl-11-oxatricyclo­[6.2.1.0 1,5 ]undec-6-en-8-ol, C 15 H 22 O 2 , which crystallizes with two mol­ecules of similar conformation in the asymmetric unit, features three fused rings, two of which are five-membered and the third six-membered. Of the two five-membered rings, the one with an O atom has a distinct envelope shape (with the O atom representing the flap). The six-membered ring is also envelope-shaped as it shares a common O atom with the five-membered ring. In the crystal, the two independent mol­ecules are linked by a pair of O—H⋯O hydrogen bonds, generating a dimer.

Curcumenol fromCurcuma zedoaria: a second monoclinic modification