InChI=1S/C16H11NO9S/c18-11(19)6-17-15(22)13-9-4-2-1-3-8(9)5-10(14(13)27(17,24)25)16(23)26-7-12(20)21/h1-5H,6-7H2,(H,18,19)(H,20,21)