Showing structure for (17r)-8,8,13,17-tetramethyl-16-[(1r)-1-(5-methyl-6-oxo-2,3-dihydropyran-2-yl)ethyl]-7-oxapentacyclo[10.7.0.0¹,³.0³,⁹.0¹³,¹⁷]nonadecan-6-one