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Three new ureido‐pyridazinone derivatives, which are structurally related to the known STAT3 inhibitor AVS‐0288, were designed by taking into account the structure–activity relationships determined for several ureido‐oxadiazole derivatives previously studied by our group. Their synthesis was first attempted through suitable 5‐aminopyridazinone intermediates (6a and 6b), which molecular structures...
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