InChI=1S/C20H22O8/c1-6-27-20-7-11(23)12(9(3)21)18(26)19(20,5)14-16(25)13(10(4)22)15(24)8(2)17(14)28-20/h24-26H,6-7H2,1-5H3/t19-,20+/m0/s1