[(2S)-1-amino-3-(5-hydroxy-1-methylindol-3-yl)-1-oxopropan-2-yl]azanium;N-[(2S)-1-amino-3-(5-hydroxy-1-methylindol-3-yl)-1-oxopropan-2-yl]-1-cyclohexyl-2-(furan-3-yl)benzimidazole-5-carboxamide;[(2S)-3-(5-hydroxy-1-methylindol-3-yl)-1-methoxy-1-oxopropan-2-yl]azanium;[(2S)-3-(1H-indol-3-yl)-1-methoxy-1-oxopropan-2-yl]azanium;methyl (2S)-3-(1,5-dimethylindol-3-yl)-2-methylpropanoate;methyl (2S)-2-methyl-3-(5-methyl-1H-indol-3-yl)propanoate