InChI=1S/C23H20O6/c24-20(15-16-22(26)27)9-7-5-3-1-2-4-6-8-18-29-23(28)17-12-19-10-13-21(25)14-11-19/h7,9-14,17,20,24-25H,5,15-16,18H2,(H,26,27)/b9-7?,17-12+