InChI=1S/C20H22O6/c1-23-18-8-13(3-4-16(18)22)20-15(9-21)14(10-24-20)6-12-2-5-17-19(7-12)26-11-25-17/h2-5,7-8,14-15,20-22H,6,9-11H2,1H3