InChI=1S/C15H12O10S/c16-7-2-1-6(3-11(7)25-26(21,22)23)10-4-8(17)13-12(24-10)5-9(18)14(19)15(13)20/h1-3,5,10,16,18-20H,4H2,(H,21,22,23)