(2E)-4-{[5-(Diethylcarbamoyl)-3-(methoxycarbonyl)-4-methyl-2-thienyl]amino}-4-oxobut-2-enoic acid;3-thiophenecarboxylic acid, 2-[[(2E)-3-carboxy-1-oxo-2-propen-1-yl]amino]-5-[(diethylamino)carbonyl]-4-methyl-, 3-methyl ester
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