InChI=1S/C20H22O7/c1-8-4-10(22)19(25)16(3)13-14(24)20(19,26)15(2)9-5-12(23)27-11(6-18(8,15)16)17(9,13)7-21/h4,9,11,13,21,25-26H,5-7H2,1-3H3/t9-,11?,13+,15+,16+,17?,18+,19+,20-/m0/s1