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Abstract
Orthogonally protected Abu(P) (benzyl (2R,S)-4-diethylphosphonyl-2-phthalimido butanoate 4) has been synthesized. It has been used as a key intermediate for the synthesis of two new phthalimido-desmuramyldipeptide analogs containing diethylphosphnate moiety at the position of ω-carboxylic group of Glu.