2-Butenoicacid, 2-methyl-,4,5,7a-tris(acetyloxy)tetradecahydro-8,11-dihydroxy-1,1,6,9-tetramethyl-9,3a-(epoxymethano)-3aH-cyclopropa[3,4]benz[1,2-f]azulen-3-ylester, [1aS-[1aa,3b(E),3aa,4a,4aa,5b,6b,7ab,8a,9a,9ab,9ba,11S*]]-