Showing structure for (1''r,3s,4''r,5'r,6''r,8''s,12''r)-1'',6'',8''-trimethyl-2h-dispiro[furan-3,2'-oxolane-5',7''-[3]oxatricyclo[6.3.1.0⁴,¹²]dodecane]-2'',3',11''-trione