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N-(4-ethoxyphenyl)-4-oxo-4-{2-[1-(2-thienyl)ethylidene]hydrazino}butanamide N-(4-ethoxyphenyl)-4-oxo-4-{(2E)-2-[1-(thiophen-2-yl)ethylidene]hydrazinyl}butanamide Butanoic acid, 4-[(4-ethoxyphenyl)amino]-4-oxo-, 2-[1-(2-thienyl)ethylidene]hydrazide