InChI=1S/C18H26O2/c1-4-6-7-8-9-10-11-15-18(20-3)16-13-12-14-17(19)5-2/h5,11,15,17-19H,2,4,6-10H2,1,3H3/b15-11-/t17-,18?/m1/s1