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The synthesis and the in vitro antimicrobial activity of all the possible 1-chlorophenyl-3-nitrophenyl-5-methylpyrazole-4-carboxylic acids and 1-chlorophenyl-3-methyl-5-nitrophenylpyrazole-4-carboxylic acids are reported. Some acids showed an interesting activity against some strains of gram-positive bacteria. The results are discussed and compared with those of other related compounds.
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