InChI=1S/C16H12O12S2/c1-25-12-3-2-8(4-14(12)28-30(22,23)24)13-7-11(18)16-10(17)5-9(6-15(16)26-13)27-29(19,20)21/h2-7,17H,1H3,(H,19,20,21)(H,22,23,24)