2,5-dihydroxypentanoic acid

N2,N5-二[芴甲氧羰基]-L-鸟氨酸

N2-[(苄氧基)羰基]鸟氨酸

2-amino-5-[[amino-(hexylamino)methylidene]amino]pentanoic acid

N-[(苄氧基)羰基]-5-(1,3-二氧代-1,3-二氢-2H-异吲哚-2-基)-L-正缬氨酸