(2R,4R)-5-(3'-chlorobiphenyl-4-yl)-2-hydroxy-4-[(5-methyl-2-oxo-[1,3]dioxol-4-ylmethoxyoxalyl)amino]pentanoic acid 5-methyl-2-oxo-[1,3]-dioxol-4-ylmethyl ester

(2R,4R)-5-(3'-chlorobiphenyl-4-yl)-4-(ethoxyoxalylamino)-2-hydroxypentanoic acid

(2R,4R)-5-(3'-chlorobiphenyl-4-yl)-2-hydroxy-4-(isopropoxyoxalylamino)pentanoic acid

(2R,4R)-5-(3'-chlorobiphenyl-4-yl)-2-hydroxy-4-(isobutoxyoxalylamino)pentanoic acid

(2R,4R)-5-(3'-chloro-[1,1'-biphenyl]-4-yl)-2-hydroxy-4-(2-((5-methyl-2-oxo-1,3-dioxol-4-yl)methoxy)-2-oxoacetamido)pentanoic acid