InChI=1S/C15H16O12/c1-25-7-3-4(12(20)21)5(2-6(7)16)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)