InChI=1S/C16H14O11S/c1-26-16-11(20)6-9(18)13(15(16)22)14(21)10(19)4-7-2-3-8(17)12(5-7)27-28(23,24)25/h2-3,5-6,17-18,20,22H,4H2,1H3,(H,23,24,25)