proclavaminic acid

(2S,3R)-2-(2-Oxoazetidine-1-yl)-3-hydroxy-5-aminovaleric acid

(2S,3R)-5-Amino-3-hydroxy-2-(2-oxoazetidin-1-yl)pentanoic acid

(2S,3R)-2-(2-Oxo-1-azetidinyl)-3-hydroxy-5-aminopentanoic acid