phenylmethyl N-[(2S)-1-[[(2S)-1-ethylamino-1-oxo-3-phenylpropan-2-yl]amino]-4-methyl-1-oxopentan-2-yl]carbamate
phenylmethyl N-[(1S)-1-[[(1S)-2-ethylamino-2-oxo-1-(phenylmethyl)ethyl]carbamoyl]-3-methyl-butyl]carbamate
N-[(1S)-1-[[[(1S)-2-ethylamino-2-oxo-1-(phenylmethyl)ethyl]amino]-oxomethyl]-3-methylbutyl]carbamic acid phenylmethyl ester
N-[(1S)-1-[[(1S)-1-(benzyl)-2-ethylamino-2-keto-ethyl]carbamoyl]-3-methyl-butyl]carbamic acid benzyl ester
phenylmethyl N-[(2S)-1-[[(2S)-1-ethylamino-1-oxo-3-phenyl-propan-2-yl]amino]-4-methyl-1-oxo-pentan-2-yl]carbamate