InChI=1S/C15H16O11/c16-6-3-5(1-2-9(18)19)8(4-7(6)17)25-15-12(22)10(20)11(21)13(26-15)14(23)24/h1-4,10-13,15-17,20-22H,(H,18,19)(H,23,24)/b2-1+