InChI=1S/C12H16O11/c13-4(10(18)19)2-1-3-5(14)22-12-8(17)6(15)7(16)9(23-12)11(20)21/h1-2,4,6-9,12-13,15-17H,3H2,(H,18,19)(H,20,21)/b2-1+