(6S)-2-hydrazinyl-6-[(4-hydroxy-4-oxobutanoyl)amino]heptanedioic acid
(6S)-2-hydrazino-6-[(4-hydroxy-4-oxo-butanoyl)amino]heptanedioic acid
(6S)-2-hydrazino-6-[(4-hydroxy-1,4-dioxobutyl)amino]heptanedioic acid
(6S)-2-hydrazino-6-[(4-hydroxy-4-keto-butanoyl)amino]pimelic acid
(6S)-2-hydrazinyl-6-[(4-hydroxy-4-oxo-butanoyl)amino]heptanedioic acid