Showing structure for (1'r,2r,2's,4's,5r,7's,8'r,9's,12's,13'r,14's,18'r)-5,7',9',13'-tetramethyl-16'-oxo-5',17'-dioxaspiro[oxane-2,6'-pentacyclo[10.7.0.0²,⁹.0⁴,⁸.0¹⁴,¹⁸]nonadecan]-13'-ylacetic acid