InChI=1S/C15H12O11S/c16-6-2-1-5(12(19)15(6)26-27(22,23)24)9-3-7(17)11-10(25-9)4-8(18)13(20)14(11)21/h1-2,4,9,16,18-21H,3H2,(H,22,23,24)