InChI=1S/C16H12O10S/c1-25-10-4-7(17)3-9-11(10)15(20)12-8(14(9)19)2-6(13(18)16(12)21)5-26-27(22,23)24/h2-4,17-18,21H,5H2,1H3,(H,22,23,24)