Showing structure for (1'r,2r,2's,4'r,5's,6'r,8'r,11'r)-5'-[(2s,3as,6ar)-5-oxo-tetrahydro-2h-furo[2,3-b]furan-2-yl]-2'-(acetyloxy)-4',5'-dimethyl-12'-oxaspiro[oxirane-2,10'-tricyclo[6.2.2.0¹,⁶]dodecan]-11'-yl (2e)-2-methylbut-2-enoate