title: (Z)-3-(3-Phenyl-allyl-idene)-1,5-dioxa-spiro-[5.5]undecane-2,4-dione.
abstract: In the title compound, C(18)H(18)O(4), the 1,3-dioxane ring adopts a distorted envelope conformation with the C atom common to the cyclo-hexane ring forming the flap. In the crystal, inversion dimers linked by pairs of C-H⋯O hydrogen bonds occur.
authors.forename: Wu-Lan
authors.initials: WL
authors.lastname: Zeng
authors.forename: Hua-Xiang
authors.initials: HX
authors.lastname: Zhang
authors.forename: Fang-Fang
authors.initials: FF
authors.lastname: Jian