Ee. Castellano et al., STRUCTURE OF A TETRACYCLIC INTERMEDIATE IN THE SYNTHESIS OF DAPHNIPHYLLUM ALKALOIDS, Acta crystallographica. Section C, Crystal structure communications, 50, 1994, pp. 124-126
Methyl 1.1.0.0(3.8).0(9,13)]tetradec-5-ene-8-carboxylate, C20H26Br2O4,
adopts an overall hemispherical conformation with the three major rin
gs all having cis ring fusion and the cyclopropane ring pointing outwa
rd from the hemisphere.