InChI=1S/C13H20O9/c14-6-4-2-1-3-5-7(15)21-13-10(18)8(16)9(17)11(22-13)12(19)20/h3,5,8-11,13-14,16-18H,1-2,4,6H2,(H,19,20)/b5-3+