InChI=1S/C18H18O11/c1-6-2-9(19)12-7(4-11(20)21)3-8(5-10(12)27-6)28-18-15(24)13(22)14(23)16(29-18)17(25)26/h2-3,5,13-16,18,22-24H,4H2,1H3,(H,20,21)(H,25,26)