Crystal structure of (±)-(7RS,8SR)-7-methyl-1,4-dioxa­spiro­[4.5]decane-7,8-diol

In the title compound, C(9)H(16)O(4), the five-membered dioxolane ring adopts a twist conformation; two adjacent C atoms deviate alternately from the mean plane of other atoms by −0.297 (4) and 0.288 (4) Å. The spiro-fused cyclo­hexane ring shows a chair form. The hy­droxy group substituted in an axial position makes an intra­molecular O—H⋯O hydrogen bond with one of the O atoms in the cyclic ether, forming an S(6) ring motif. In the crystal, the O—H⋯O hydrogen bond involving the equatorial hy­droxy group connects the mol­ecules into a zigzag chain with a C(5) motif running along the c axis.