InChI=1S/C16H16O11/c1-26-10-6-8(2-4-9(10)17)3-5-12(20)27-13(14(21)22)16(25,15(23)24)7-11(18)19/h2-6,13,17,25H,7H2,1H3,(H,18,19)(H,21,22)(H,23,24)/b5-3+