Showing structure for (3as,4s,5s,6r,6as,7r,9ar,9br)-5,7-dihydroxy-9-methyl-3-methylidene-2-oxo-4,5,6a,7,9a,9b-hexahydro-3ah-spiro[azuleno[4,5-b]furan-6,2'-oxiran]-4-yl (2e)-2-methylbut-2-enoate