InChI=1S/C12H16O11/c1-3(2-4(13)14)8(10(18)19)22-12-7(17)5(15)6(16)9(23-12)11(20)21/h2,5-9,12,15-17H,1H3,(H,13,14)(H,18,19)(H,20,21)/b3-2+