Showing structure for (1's,2r,2's,4's,5s,7's,8'r,9's,12's,13's,14's,15'r,16'r,18's)-5,7',9',13'-tetramethyl-5'-oxaspiro[oxane-2,6'-pentacyclo[10.8.0.0²,⁹.0⁴,⁸.0¹³,¹⁸]icosane]-14',15',16',18'-tetrol