InChI=1S/C16H22O11/c1-7(13(20)21)4-2-3-5-8(14(22)23)6-26-16-11(19)9(17)10(18)12(27-16)15(24)25/h2-4,8-12,16-19H,5-6H2,1H3,(H,20,21)(H,22,23)(H,24,25)/b3-2+,7-4+