Showing structure for (1'r,2r,2'r,3's,6's,11's)-3'-ethyl-4-methyl-11'-[(2s,4s)-4-methyl-5-oxooxolan-2-yl]-5'-oxa-10'-azaspiro[furan-2,4'-tricyclo[8.3.0.0²,⁶]tridecane]-5,7'-dione