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In the title compound, C 19 H 28 O 2 , the A ring adopts a chair conformation. Both the  B  and  C  rings adopt envelope conformations with the C atoms common to both rings and adjacent to the carbonyl and hydroxyl groups, respectively, lying 0.604 (3) and 0.634 (3) Å out of the mean planes defined by the remaining five C atoms of rings  B  and  C , respectively (r.m.s. deviations = 0.0100 and 0.0157 Å, respectively). The formation of linear supra­molecular  C (7) chains along the  a  axis mediated by hy­droxy-O—H⋯O(carbon­yl) hydrogen bonds is the most prominent feature of the crystal packing.

acta crystallographica. section e

(4R*,4aS*,4bS*,5R*,10aR*)-4-Hydroxy-4a,5-dimethyl-2-(propan-2-yl)-1,4,4a,4b,5,6,7,8,10,10a-decahydrophenanthren-1-one