Showing structure for (1r,1's,2s,3s,4s,6's,9'r)-2-formyl-4-hydroxy-3-methyl-10'-methylidene-2',11'-dioxo-3'-oxaspiro[cyclohexane-1,5'-tricyclo[7.2.1.0¹,⁶]dodecan]-3-yl acetate