4H-Cyclopenta[b]thiophene-3-carboxylic acid, 2-[[(ethylamino)thioxomethyl]amino]-5,6-dihydro-, ethyl ester;Ethyl 2-[(ethylcarbamothioyl)amino]-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxylate
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