Showing structure for (9r,13r,16r,17r)-8,8,13,17-tetramethyl-16-[(1s)-1-[(2s)-5-methyl-6-oxo-2,3-dihydropyran-2-yl]ethyl]-7-oxatetracyclo[10.7.0.0³,⁹.0¹³,¹⁷]nonadeca-1(12),2,4-trien-6-one