InChI=1S/C20H18O3/c1-23-17-11-13-7-9-15(21)14-8-10-16(22)20(18(13)14)19(17)12-5-3-2-4-6-12/h2-7,9,11,16,21-22H,8,10H2,1H3/t16-/m0/s1