InChI=1S/C10H14N2O7S/c13-6(10(18)19)1-2-7(14)12-5(4-20)9(17)11-3-8(15)16/h5,20H,1-4H2,(H,11,17)(H,12,14)(H,15,16)(H,18,19)/t5-/m0/s1