%0 Journal Article %T (Z)-3-(3-Phenylallylidene)-1,5-dioxaspiro[5.5]undecane-2,4-dione %A Wu-Lan Zeng %A Hua-Xiang Zhang %A Fang-Fang Jian %J Acta Crystallographica Section E %D 2009 %I International Union of Crystallography %R 10.1107/s1600536809038781 %X In the title compound, C18H18O4, the 1,3-dioxane ring adopts a distorted envelope conformation with the C atom common to the cyclohexane ring forming the flap. In the crystal, inversion dimers linked by pairs of C¡ªH...O hydrogen bonds occur. %U http://scripts.iucr.org/cgi-bin/paper?S1600536809038781