InChI=1S/C15H10O10S/c16-8-2-5(4-25-26(22,23)24)1-6-10(8)14(20)11-7(12(6)18)3-9(17)13(19)15(11)21/h1-3,16-17,19,21H,4H2,(H,22,23,24)