InChI=1S/C13H13N5O4S/c14-7-5-10(13(19)20)12(11(15)6-7)18-17-8-1-3-9(4-2-8)23(16,21)22/h1-6H,14-15H2,(H,19,20)(H2,16,21,22)/b18-17+