(4aS.6aS.6bR.10S.12aR.14bR)-methyl 10-acetoxy-2.2.6a.6b.9.9.12a-heptamethyl-1.2.3.4.4a.5.6.6a.6b.7.8.8a.9.10.11.12.12a.12b.13.14b-icosahydropicene-4a-carboxylate