InChI=1S/C11H11NO9S/c13-9(14)5-8(11(16)17)12-10(15)6-1-3-7(4-2-6)21-22(18,19)20/h1-4,8H,5H2,(H,12,15)(H,13,14)(H,16,17)(H,18,19,20)