InChI=1S/C18H18O8/c1-25-13-5-10(22)14(8(6-19)11(23)7-20)18-16(13)17(24)15-9(21)3-2-4-12(15)26-18/h2-5,8,11,19-23H,6-7H2,1H3/t8-,11+/m0/s1