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The title compound, C 16 H 20 O 5 , was synthesized from ilicic acid [2-(8-hy­droxy-4a,8-dimethyl­deca­hydro­naphthalen-2-yl)acrylic acid], which was isolated from the chloro­form extract of the aerial part of  Inula viscose  (L) Aiton [or  Dittrichia viscosa­  (L) Greuter]. The molecule is built up from two fused six-membered rings, the epoxidized six-membered ring adopts a half-chair conformation while the other ring displays a perfect chair conformation. The crystal structure features C—H⋯O hydrogen bonds.

Methyl 2-(1a,4a-dimethyl-2,8-dioxo-2,3,4,4a,5,6,7,8-octahydro-1aH-1-oxacyclopropa[d]naphthalen-7-yl)acrylate