InChI=1S/C16H22O11/c1-5(13(20)21)3-7-8(25-7)4-6(2)15(24)27-16-11(19)9(17)10(18)12(26-16)14(22)23/h3,6-12,16-19H,4H2,1-2H3,(H,20,21)(H,22,23)/b5-3+