5-tert-Butyl-1H-pyrazole-3-carboxylicacid ethyl ester;Ethyl 3-tert-butyl-2H-pyrazole-5-carboxylate;Ethyl5-(1,1-dimethylethyl)-1H-pyrazole-3-carboxylate;Ethyl5-tert-butyl-2H-pyrazole-3-carboxylate;
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