InChI=1S/C11H15NO11/c13-4(14)2-1-3(12-21)10(20)23-11-7(17)5(15)6(16)8(22-11)9(18)19/h5-8,11,15-17,21H,1-2H2,(H,13,14)(H,18,19)/b12-3+