InChI=1S/C19H18O9/c1-18(27)6-3-2-4-7(20)10(6)15(24)11-12(18)16(25)13-14(23)8(21)5-9(22)19(13,28)17(11)26/h2-4,8,11-13,16,20-21,25,27-28H,5H2,1H3/t8?,11?,12?,13?,16?,18-,19+/m1/s1