1H-Pyrazole-3-carboxylic acid,4-[[4-(2-ethoxy-2-oxoethoxy)carbony]phenyl]azo]-4,5-dihydro-5-oxo-1-phenyl-,ethyl ester;4-[4-(Ethoxycarbonylmethoxycarbonyl)phenylazo]-5-hydroxy-1-phenyl-1H-pyrazole-3-carboxylic acid ethyl ester
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