InChI=1S/C16H20O11/c1-23-7-5-4-6(11(24-2)12(7)25-3)15(22)27-16-10(19)8(17)9(18)13(26-16)14(20)21/h4-5,8-10,13,16-19H,1-3H3,(H,20,21)