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