InChI=1S/C19H22O3/c20-17(9-5-4-8-15-6-2-1-3-7-15)12-10-16-11-13-18(21)19(22)14-16/h1-4,6-8,11,13-14,17,20-22H,5,9-10,12H2/b8-4+