InChI=1S/C15H12O11S/c16-7-4-8(17)13(9(18)5-7)14(22)10(19)1-6-2-11(20)15(12(21)3-6)26-27(23,24)25/h2-5,16-18,20-21H,1H2,(H,23,24,25)