(2R,3R)-2,3-bis(benzoyloxy)-4-((1-(diphenoxyphosphoryl)ethyl)amino)-4-oxobutanoic acid

1-(2-aminopropanoylamino)ethylphosphonic acid

(S)-1-(N-phenylacetylamino)ethylphosphonic acid

S(+)-2-aziridinephosphonic acid

N-((S)-1-((2R,4S,5R)-3,4-dimethyl-2-oxido-5-phenyl-1,3,2-oxazaphospholidin-2-yl)ethyl)benzamide