InChI=1S/C15H16O10/c16-7-2-3-8(6(5-7)1-4-9(17)18)24-15-12(21)10(19)11(20)13(25-15)14(22)23/h1-5,10-13,15-16,19-21H,(H,17,18)(H,22,23)/b4-1+