InChI=1S/C16H14O11S/c1-25-15-9(19)5-10-11(12(15)20)13(21)16(27-28(22,23)24)14(26-10)6-2-3-7(17)8(18)4-6/h2-5,14,16-20H,1H3,(H,22,23,24)