Burrett, S.Taylor, D.Tiekink, E.2015-09-302015-09-302014Acta Crystallographica Section E, 2014; 70(7):o758-o7581600-53681600-5368http://hdl.handle.net/2440/94784Organic compounds. Supporting information is sup-1 to sup-7The title compound, C15H24O2 [systematic name: (4S,4aR,6R,8aR)-4a-hy-droxy-4,8a-dimethyl-6-(prop-1-en-2-yl)octahydro-naphthalen-1(2H)-one], features two edge-shared six-membered rings with the hydroxyl and methyl substituents at this bridge being trans. One adopts a flattened chair conformation with the C atoms bearing the carbonyl and methyl substituents lying 0.5227 (16) and 0.6621 (15) Å, respectively, above and below the mean plane through the remaining four C atoms (r.m.s. deviation = 0.0145 Å). The second ring, bearing the prop-1-en-2-yl group, has a chair conformation. Supra-molecular helical chains along the b axis are found in the crystal packing, which are sustained by hy-droxy-carbonyl O-H⋯O hydrogen bonding.en© International Union of Crystallography. Open Access.Journal article003001018210.1107/S16005368140129382-s2.0-8490416285584025Taylor, D. [0000-0002-3302-4610] [0000-0002-4274-3983] [0000-0003-0633-7424]