N-[(2R)-1-[[(1R)-1-acetamido-2-(1H-indol-3-yl)ethyl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]-2-dimethylamino-2-methylpropanamide N-[(1R)-2-[[(1R)-1-acetamido-2-(1H-indol-3-yl)ethyl]amino]-1-(1H-indol-3-ylmethyl)-2-oxo-ethyl]-2-dimethylamino-2-methyl-propanamide N-[(1R)-2-[[(1R)-1-acetamido-2-(1H-indol-3-yl)ethyl]amino]-1-(1H-indol-3-ylmethyl)-2-oxoethyl]-2-dimethylamino-2-methylpropanamide N-[(1R)-2-[[(1R)-1-acetamido-2-(1H-indol-3-yl)ethyl]amino]-1-(1H-indol-3-ylmethyl)-2-keto-ethyl]-2-dimethylamino-2-methyl-propionamide N-[(2R)-1-[[(1R)-1-acetamido-2-(1H-indol-3-yl)ethyl]amino]-3-(1H-indol-3-yl)-1-oxo-propan-2-yl]-2-dimethylamino-2-methyl-propanamide