InChI=1S/C16H13ClN4O7S/c1-9(22)15(16(23)18-12-5-3-2-4-11(12)17)20-19-13-7-6-10(29(26,27)28)8-14(13)21(24)25/h2-8,15H,1H3,(H,18,23)(H,26,27,28)/b20-19+