InChI=1S/C16H22O11/c1-6(13(20)21)4-3-5-8(7(2)14(22)23)26-16-11(19)9(17)10(18)12(27-16)15(24)25/h3-5,7-12,16-19H,1-2H3,(H,20,21)(H,22,23)(H,24,25)/b5-3+,6-4+