1 R4B N-[(2s)-3-[(R)-(4-bromophenyl)(hydroxy)phosphoryl]-2-{[3-(3'-chlorobiphenyl-4-yl)-1,2-oxazol-5-yl]methyl}propanoyl]-L-a lanyl-L-alaninamide 1.000 2 R47 N-[(2s)-3-[(S)-(4-bromophenyl)(hydroxy)phosphoryl]-2-{[3-(3'-chlorobiphenyl-4-yl)-1,2-oxazol-5-yl]methyl}propanoyl]-L-alpha-glutamyl-L-alpha-glutamine 0.846 3 R4C N-{(2s)-3-[(R)-(4-bromophenyl)(hydroxy)phosphoryl]-2-[(3-phenyl-1,2-oxazol-5-yl)methyl]propanoyl}-L-alanyl-L-alaninamid E 0.841 4 R45 N-{(2s)-3-[(S)-(4-bromophenyl)(hydroxy)phosphoryl]-2-[(3-phenyl-1,2-oxazol-5-yl)methyl]propanoyl}-L-alpha-glutamyl-L-al pha-glutamine 0.712