Showing structure for (3ar,4s,5r,6s,7s,7ar)-6-ethenyl-4-hydroxy-6-methyl-3-methylidene-2-oxo-5-(3-oxoprop-1-en-2-yl)-tetrahydro-3ah-1-benzofuran-7-yl (2z)-2-methylbut-2-enoate