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