InChI=1S/C18H26O3/c1-2-15-13-14-17(19)16(15)11-9-7-5-3-4-6-8-10-12-18(20)21/h7,9,11,13-15H,2-6,8,10,12H2,1H3,(H,20,21)/b9-7-,16-11-