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The stereochemistry of the title compound, C15H26O3, has been established. The compound crystallizes with three molecules in the asymmetric unit and significant variations in the bond distances and angles are reported. Intermolecular hydrogen bonds are observed between the hydroxyl groups.

The title compound, C20H28O2, is a new totarolone which was isolated from Tetra­clinis articulata wood. The mol­ecule forms an extended sheet of three fused rings which exhibit different conformations. The non-aromatic oxo-substituted ring has a screw boat conformation, while the central ring has a half-chair conformation. Mol­ecules are linked to each other by inter­molecular O—H⋯O hydrogen bonds involving carbonyl and hydroxyl groups.

The hemisynthesis of the title compound, C22H32O2, was carried out through direct acetylation reaction of the naturally occurring diterpene totarol [systematic name: (4bS,8aS)-4b,8,8-trimethyl-1-propan-2-yl-5,6,7,8a,9,10-hexahydrophenanthren-2-ol]. The molecule is built up from three fused six membered rings, one saturated and two unsaturated. The central unsaturated ring has a half-chair conformation, whereas the other unsaturated ring displays a chair conformation. The absolute configuration is deduced from the chemical pathway. The value of the Hooft parameter [−0.10 (6)] allowed this absolute configuration to be confirmed.

The stereochemistry of the title compound, C15H26O2, has been established. Intermolecular hydrogen bonds are observed between the hydroxyl groups.

The title compound, C(20)H(28)O(2), commonly named Sugiol, is a natural oxygenated diterpene that we have isolated for the first time from a hexane extract of the fruits of Juniperus Oxycedrus L. Its X-ray crystal structure determination confirms an abietane skeleton which was predicted by spectroscopic analysis, mainly by (1)H and (13)C NMR. The cyclo-hexane ring adopts a flattened chair conformation, while the cyclo-hexene ring adopts an envelope conformation. The mol-ecules are linked through O-H⋯O hydrogen bonds to form a zigzag chain extending parallel to the c axis.