InChI=1S/C12H18O9/c1-5(4-6(13)14)2-3-20-12-9(17)7(15)8(16)10(21-12)11(18)19/h4,7-10,12,15-17H,2-3H2,1H3,(H,13,14)(H,18,19)/b5-4+