4H-cyclohepta[b]thiophene-3-carboxylic acid, 2-[(2,4-dimethoxybenzoyl)amino]-5,6,7,8-tetrahydro-, 1-methylethyl ester;Isopropyl 2-[(2,4-dimethoxybenzoyl)amino]-5,6,7,8-tetrahydro-4H-cyclohepta[b]thiophene-3-carboxylate
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