InChI=1S/C11H14O11/c12-4(13)1-3(9(17)18)2-21-11-7(16)5(14)6(15)8(22-11)10(19)20/h1,5-8,11,14-16H,2H2,(H,12,13)(H,17,18)(H,19,20)/b3-1+