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6??,??-Disubstituted ??-acylaminocarboxylic acids Communication 2. A new method of preparing oxazole-4-carboxylic acids, Bulletin of the Academy of Sciences of the USSR, Division of chemical science A combinatorially convenient version of synthesis of 5-substituted oxazole-4-carboxylic acid ethyl esters, Russian Journal of Organic Chemistry Synthesis of methyl 2-aryl-5-chlorosulfonyl-1,3-oxazole-4-carboxylates and their reactions with amines and amidines, Russian Journal of General Chemistry Synthesis and transformations of derivatives of 2-aryl-5-(3,5-dimethyl-1H-pyrazol-1-yl)-1,3-oxazole-4-carboxylic acid, Russian Journal of General Chemistry Synthesis of 4-hetaryl-substituted 5-amino- and 5-sulfanyl-1,3-oxazole derivatives, Russian Journal of General Chemistry