InChI=1S/C12H16O9/c13-6(14)4-2-1-3-5-20-12-9(17)7(15)8(16)10(21-12)11(18)19/h1-4,7-10,12,15-17H,5H2,(H,13,14)(H,18,19)/b3-1+,4-2-