The crystal and molecular structure of the bisnorditerpenoid, inumakilactone

Abstract

Inumakilactone, (C₁₈H₂₀O₈), crystallizes in space group P2₁2₁2₁ with a = 8.15(2), b = 11.15(1), c = 17.88(2) Ǻ, Z = 4. The structure was solved by direct methods from visually estimated film data and refined to an R of 0.091 for 1338 independent reflections. The structure of the bisnorditerpenoid molecule differs from that previously proposed in respect of the orientation of the epoxy group on ring B.