InChI=1S/C15H16O12/c1-25-10-5(16)3-2-4(6(10)12(20)21)14(24)27-15-9(19)7(17)8(18)11(26-15)13(22)23/h2-3,7-9,11,15-19H,1H3,(H,20,21)(H,22,23)