InChI=1S/C12H16O11/c13-3-4(1-5(14)15)2-6(16)22-12-9(19)7(17)8(18)10(23-12)11(20)21/h2,7-10,12-13,17-19H,1,3H2,(H,14,15)(H,20,21)/b4-2-