(Z)-ethyl 2-(4-nitrophenylamino)-4-oxo-5-(3,4,5-trimethoxybenzylidene)-4,5-dihydrothiophene-3-carboxylate;3-thiophenecarboxylic acid, 4,5-dihydro-2-[(4-nitrophenyl)amino]-4-oxo-5-[(3,4,5-trimethoxyphenyl)methylene]-, ethyl ester, (5Z)-
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