InChI=1S/C18H18O10/c19-12(27-18-15(22)13(20)14(21)16(28-18)17(23)24)4-2-1-3-9-5-6-10-11(7-9)26-8-25-10/h1-7,13-16,18,20-22H,8H2,(H,23,24)/b3-1-,4-2+