N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-4-chloro-5-methoxy-1H-indole-2-carboxamide;4-chloro-N-[(2S)-1-[[(1S)-1-cyano-2-[(3S)-2-oxopiperidin-3-yl]ethyl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-5-methoxy-1H-indole-2-carboxamide;4-chloro-5-methoxy-1H-indole-2-carboxylic acid;methyl (2S)-2-[[(2S)-2-aminochloranuidyl-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(4-chloro-5-methoxy-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate