Showing structure for methyl 9'-[1-(furan-3-yl)-1-oxopropan-2-yl]-3',4,4,6'-tetramethyl-4',6-dioxo-3,3a-dihydro-5',10'-dioxaspiro[furo[3,2-c]pyran-2,2'-tricyclo[4.3.1.0³,⁷]decane]-1'-carboxylate