1-Methyl-2-carboxy-3-(4-pyridylethoxymethyl)indole hydrochloride 1H-Indole-2-carboxylic acid, 3-(ethoxy-4-pyridinylmethyl)-1-methyl-, monohydrochloride 3-(Ethoxy-4-pyridinylmethyl)-1-methyl-1H-indole-2-carboxylic acid monohydrochloride 67748-91-8