InChI=1S/C20H26O3/c1-18-7-5-16-14(6-9-23-16)15(18)4-8-19-10-13(2-3-17(18)19)20(22,11-19)12-21/h4,6,9,13,17,21-22H,2-3,5,7-8,10-12H2,1H3/t13?,17?,18-,19+,20+/m1/s1