InChI=1S/C20H22O7/c1-20(2,26)6-5-12-15(23)8-16(24)17-18(25)13(9-27-19(12)17)11-4-3-10(21)7-14(11)22/h3-4,7-8,13,21-24,26H,5-6,9H2,1-2H3