InChI=1S/C22H20O6/c1-12(2)4-6-14-21(24)19(25-3)9-15-20(23)16(10-26-22(14)15)13-5-7-17-18(8-13)28-11-27-17/h4-5,7-10,24H,6,11H2,1-3H3