Showing structure for (1r,1's,2s,3r,6's,7'r,9's)-2-formyl-7'-hydroxy-3-methyl-10'-methylidene-2',11'-dioxo-3'-oxaspiro[cyclohexane-1,5'-tricyclo[7.2.1.0¹,⁶]dodecan]-3-yl acetate