InChI=1S/C15H18O9/c16-6-11(20)13(22)15(24)14(23)12(21)9(18)4-2-7-1-3-8(17)10(19)5-7/h1-5,11,13-17,19-20,22-24H,6H2/b4-2+/t11-,13-,14+,15+/m1/s1