tert-butyl N-[(2S,3S,5R)-5-benzyl-6-[[(1R)-2,3-dihydro-1H-inden-1-yl]amino]-3-hydroxy-6-oxo-1-phenylhexan-2-yl]carbamate

tert-butyl N-[(2S,3S,5R)-6-[[(1S,2R,3R)-3-amino-2-hydroxy-2,3-dihydro-1H-inden-1-yl]amino]-5-benzyl-3-hydroxy-6-oxo-1-phenylhexan-2-yl]carbamate

tert-butyl N-[(2S,3S,5R)-5-benzyl-3-hydroxy-6-[[(2S)-4-methyl-1-oxo-1-(2-phenylethylamino)pentan-2-yl]amino]-6-oxo-1-phenylhexan-2-yl]carbamate

tert-butyl N-[(2S,3S,5R)-5-benzyl-6-[[(1S,2S,3R)-2,3-dihydroxy-2,3-dihydro-1H-inden-1-yl]amino]-3-hydroxy-6-oxo-1-phenylhexan-2-yl]carbamate

tert-butyl N-[(2S,3S,5R)-5-benzyl-6-[[(2S,3S)-1-(benzylamino)-3-methyl-1-oxopentan-2-yl]amino]-3-hydroxy-6-oxo-1-phenylhexan-2-yl]carbamate