SEARCH Articles Figures Tables 5-Methoxy-4-methyl Carboxylic acids methyl esters Carboxylic acids methylation Carboxylic methyl esters Indole acidity Indole acids Indole carboxylate Indole-2-carboxylic acids Indole-3-carboxylic acid methylated Indoles acidity Indoles, methylated Indolic acids Methoxy-indole Methyl 2- indole-3-carboxylate Methyl carboxylate