InChI=1S/C15H18O8/c16-7-11(19)13(21)15(23)14(22)12(20)10(18)6-5-8-3-1-2-4-9(8)17/h1-6,11,13-17,19,21-23H,7H2/b6-5+/t11-,13-,14+,15+/m1/s1