InChI=1S/C16H14O11S/c1-26-13-4-7(3-12(21)16(13)27-28(23,24)25)2-11(20)15(22)14-9(18)5-8(17)6-10(14)19/h3-6,17-19,21H,2H2,1H3,(H,23,24,25)