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