L-N-(2-(benzyloxy)benzoyl)serine isopropyl ester

methyl N6-acetyl-N6-(benzyloxy)-N2-(tert-butoxycarbonyl)-L-lysinate

6-(Acetyl-benzyloxy-amino)-2-[(S)-2-(2-benzyloxy-benzoylamino)-3-hydroxy-propionylamino]-hexanoic acid methyl ester

6-(Acetyl-benzyloxy-amino)-2-{[(R)-2-(2-benzyloxy-phenyl)-4,5-dihydro-oxazole-4-carbonyl]-amino}-hexanoic acid methyl ester