Specificity in enzyme inhibition. 1. Synthesis of 4-(4-imidazolyl)-3-amino-2-butanone, 4-(4-imidazolyl)-3-acetamido-2-butanone, and 4-(4-imidazolylmethyl)-2,5-dimethyloxazole for assay as inhibitors of histidine decarboxylase.

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