InChI=1S/C13H13BrN2O5S/c14-10-2-1-9(22-10)6-4-16(13(20)15-12(6)19)11-3-7(18)8(5-17)21-11/h1-2,4,7-8,11,17-18H,3,5H2,(H,15,19,20)/t7-,8+,11+/m0/s1