tert-butyl 5-(4-(2-oxoethoxy)phenyl)isoxazole-3-carboxylate

5-(4-(3-((6-((4-benzoylbenzyl)amino)-6-oxohexyl)amino)-2-(N-benzylhex-5-ynamido)-3-oxopropoxy)phenyl)isoxazole-3-carboxylic acid

5-(4-(3-((6-((4-benzoylbenzyl)amino)-6-oxohexyl)amino)-3-oxo-2-(N-phenethylhex-5-ynamido)propoxy)phenyl)isoxazole-3-carboxylic acid

5-(4-(3-((6-((4-benzoylbenzyl)amino)-6-oxohexyl)amino)-3-oxo-2-(N-(3-phenylpropyl)hex-5-ynamido)propoxy)phenyl)isoxazole-3-carboxylic acid

5-(4-(3-((6-((4-benzoylbenzyl)amino)-6-oxohexyl)amino)-3-oxo-2-(N-(4-phenylbutyl)hex-5-ynamido)propoxy)phenyl)isoxazole-3-carboxylic acid