SEARCH Articles Figures Tables 5- methyl-3 - isoxazole 5-Methyl-3-isoxazole carboxylic acid Acid hydrazides Carboxylic acids methylation Carboxylic hydrazides Hydrazide carboxylates Isoxazole acids Isoxazole-5-carboxylates Isoxazole-carboxylic acids Methyl carboxylate