Showing structure for (3ar,4r,5as,9as,9bs)-5a,9-dimethyl-3-methylidene-2-oxo-3ah,4h,5h,6h,7h,9ah,9bh-naphtho[1,2-b]furan-4-yl (2e)-4-hydroxy-2-methylbut-2-enoate