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