InChI=1S/C21H22O6/c1-22-16-5-3-12(7-18(16)23-2)20-14-9-25-21(15(14)10-24-20)13-4-6-17-19(8-13)27-11-26-17/h3-8,14-15,20-21H,9-11H2,1-2H3