InChI=1S/C12H18O9/c1-2-5(3-6(13)14)4-20-12-9(17)7(15)8(16)10(21-12)11(18)19/h3,7-10,12,15-17H,2,4H2,1H3,(H,13,14)(H,18,19)/b5-3+