InChI=1S/C11H14O11/c12-4(13)2-1-3(9(17)18)21-11-7(16)5(14)6(15)8(22-11)10(19)20/h1-3,5-8,11,14-16H,(H,12,13)(H,17,18)(H,19,20)/b2-1+