Acta Cryst. (2003). E59, o347-o349  [ doi:10.1107/S1600536803003374 ]

The acetyl derivative of humirianthol

R. A. Burrow, A. F. Morel, I. B. Graebner, D. H. Farrar and A. J. Lough

Abstract: The title compound, 15-acetato-3,20:14,16-diepoxy-3-hydroxy-9-epi-7-pimaren-19,6-olide, C₂₂H₂₈O₇, formed from the acetylation of humirianthol, isolated from the tubers of Humirianthera ampla, crystallizes in the chiral space group P2₁2₁2₁. The absolute configuration was set using the absolute configuration of C15, as determined by the Horeau method. The structure comprises a pimarane ring system with a methylene ether bridge over ring A, a double bond in ring B, and two five-membered furanyl rings, one fused to rings A and B and the other to ring C.

Online 21 February 2003

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