InChI=1S/C21H20O3/c1-23-17-11-8-14-12-18(24-2)20(13-6-4-3-5-7-13)21-16(22)10-9-15(17)19(14)21/h3-8,11-12,16,22H,9-10H2,1-2H3/t16-/m1/s1