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5-[Bis(2-ethoxy-2-oxoethyl)amino]-4-cyano-2-(ethoxycarbonyl)-3-thiopheneacetic acid ethyl ester

Quality standard:
Appearance: White to pale yellow crystalline powder Mp : 106-107^oC
Assay≥99.0 % , Total impurity < 0.5 % , Individual impurity < 0.2 %