Showing structure for bis((1's,2r,2's,4's,5r,7's,8'r,9's,12's,13'r)-5,7',9',13'-tetramethyl-5'-oxaspiro[oxane-2,6'-pentacyclo[10.8.0.0²,⁹.0⁴,⁸.0¹³,¹⁸]icosan]-17'-en-16'-one)