(2a<i>R</i>*,5<i>S</i>*,6a<i>S</i>*,8a<i>S</i>*,<i>E</i>)-Ethyl 5-hydroxy-7,7,8a-trimethyl-8-oxo-2,2a,6,6a,7,8,8a,8b-octahydro-1<i>H</i>-pentaleno[1,6-<i>bc</i>]oxepine-4-carboxylate
Acta crystallographica. Section E