acetoxymethyl (R)-3-(2-(2-(tert-butoxy)-2-oxoacetyl)-1-((5'-chloro-2'-fluoro-[1,1'-biphenyl]-4-yl)methyl)hydrazineyl)-2-hydroxypropanoate

(R)-3-[N-(5'-chloro-2'-fluoro-iphenyl-4-ylmethyl)-N'-oxalylhydrazino]-2-hydroxypropionic acid 2,2-difluoropropyl ester

(R)-3-[N'-t-butoxyoxalyl-N-(5'-chloro-2'-fluorobiphenyl-4-ylmethyl)hydrazino]-2-hydroxypropionic acid