InChI=1/C12H7ClN2O4S/c13-8-1-2-9-7(5-8)6-12(19-9)20(17,18)11-4-3-10(16)14-15-11/h1-6H,(H,14,16)/p-1/fC12H6ClN2O4S/q-1 50B35E6419B33E39