InChI=1S/C16H14O9S/c1-24-12-5-8(18)4-10-14(12)15(20)13-9(16(10)25-26(21,22)23)2-7(6-17)3-11(13)19/h2-5,16-19H,6H2,1H3,(H,21,22,23)