InChI=1S/C15H14O10/c16-9-4-1-8(2-5-9)3-6-11(19)25-12(13(20)21)15(24,14(22)23)7-10(17)18/h1-6,12,16,24H,7H2,(H,17,18)(H,20,21)(H,22,23)/b6-3+