InChI=1/C11H6N2O6S/c14-10-9(20-11(15)12-10)2-5-1-7-8(19-4-18-7)3-6(5)13(16)17/h1-3H,4H2,(H,12,14,15)/b9-2+/f/h12H 44940C26FE2994B7