InChI=1S/C12H16O11/c13-5(14)1-4(2-6(15)16)3-22-12-9(19)7(17)8(18)10(23-12)11(20)21/h1,7-10,12,17-19H,2-3H2,(H,13,14)(H,15,16)(H,20,21)/b4-1-