InChI=1S/C16H16O11/c17-8-9(18)12(14(20)21)26-16(10(8)19)27-15(22)13-11(25-13)5-1-2-6-7(3-5)24-4-23-6/h1-3,8-13,16-19H,4H2,(H,20,21)