InChI=1S/C20H26O2/c1-6-15(2)14-17(19-20(3,4)22-19)9-7-8-16-10-12-18(21-5)13-11-16/h6-8,10-14,17,19H,1,9H2,2-5H3/b8-7-,15-14-