InChI=1S/C19H17N5O5S/c1-11-9-12(2)21-19(20-11)24-30(28,29)15-6-3-13(4-7-15)22-23-14-5-8-17(25)16(10-14)18(26)27/h3-10,25H,1-2H3,(H,26,27)(H,20,21,24)/b23-22+