InChI=1S/C23H20O6/c24-20-14-11-19(12-15-20)13-16-23(28)29-17-9-7-5-3-1-2-4-6-8-10-21(25)18-22(26)27/h6,8,11-16,21,24-25H,4,10,17-18H2,(H,26,27)/b8-6+,16-13+