16200-03-6 4-((Diethylamino)methyl)-1,2-dimethyl-5-hydroxyindole-3-carboxylic acid ethyl ester HCl Indole-3-carboxylic acid, 4-((diethylamino)methyl)-1,2-dimethyl-5-hydroxy-, ethyl ester, monohydrochloride