InChI=1S/C16H12O11S/c17-5-6-1-2-8(16(12(6)20)27-28(23,24)25)15-14(22)13(21)11-9(19)3-7(18)4-10(11)26-15/h1-4,17-20,22H,5H2,(H,23,24,25)