1-Methyl-3-carbethoxy-5-hydroxypyrazole;2-Methyl-3-hydroxy-5-(ethoxycarbonyl)pyrazole;3-Ethoxycarbonyl-5-hydroxy-1-methylpyrazole;5-Hydroxy-1-methyl-1H-pyrazole-3-carboxylic acid ethyl ester;Ethyl5-hydroxy-1-methyl-3-pyrazolecarboxylate;
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