InChI=1S/C17H16O12S/c1-27-12-5-7(4-10(20)16(12)29-30(24,25)26)3-9(19)14(22)13-8(18)6-11(21)17(28-2)15(13)23/h4-6,18,20-21,23H,3H2,1-2H3,(H,24,25,26)