Methyl 1-(4-chlorophenyl)-2,3,4,9-tetrahydro-1H-β-carboline-3-car boxylate

methyl 3-(1H-indol-3-yl)-2-(1-methyl-4-oxo-2H-quinazolin-3-yl)propanoate

methyl 3-(1H-indol-3-yl)-2-[[3-methyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]butanoyl]amino]propanoate

methyl 3-(1H-indol-3-yl)-2-[[2-(phenylmethoxycarbonylamino)acetyl]amino]propanoate

methyl 5-(1H-indol-3-yl)-2-methyl-1,3-oxazole-4-carboxylate