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