InChI=1S/C23H20O6/c24-20-15-12-19(13-16-20)14-17-22(26)29-18-10-8-6-4-2-1-3-5-7-9-11-21(25)23(27)28/h5,7,12-17,21,24-25H,3,9,11,18H2,(H,27,28)/b7-5+,17-14+