InChI=1S/C18H15NO8S/c1-19-12-6-9-4-2-3-5-10(9)15-14(12)11(7-13-17(15)26-8-25-13)16(18(20)21)27-28(22,23)24/h2-7,16,19H,8H2,1H3,(H,20,21)(H,22,23,24)