2-(5-hydroxy-1H-indol-3-yl)ethylazanium chloride 2-(5-hydroxy-1H-indol-3-yl)ethylammonium chloride 3-(2-aminoethyl)-1H-indol-5-ol hydrochloride 153-98-0 Prestwick_447 Serotonin hydrochloride 3-(2-Aminoethyl)-5-hydroxyindole hydrochloride H9523_SIGMA EU-0100607 1H-Indol-5-ol, 3-(2-aminoethyl)-, monohydrochloride 5-Hydroxytryptamine hydrochloride CCRIS 4420 SBB003418