InChI=1S/C16H18O12/c1-25-6-4-3-5(7(13(20)21)11(6)26-2)15(24)28-16-10(19)8(17)9(18)12(27-16)14(22)23/h3-4,8-10,12,16-19H,1-2H3,(H,20,21)(H,22,23)