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