N-[6-(2,3-difluorophenyl)-2-oxo-1-(2,2,2-trifluoroethyl)-2,3,4,7-tetrahydro-1H-azepin-3-yl]acetamide

Benzyl (2R,5E)-2-(bis{[(2-methyl-2-propanyl)oxy]carbonyl}amino)-6 -nitro-5-hexenoate

1-Benzyl 5-methyl N,N-bis{[(2-methyl-2-propanyl)oxy]carbonyl}-D-g lutamate

Benzyl N,N-bis{[(2-methyl-2-propanyl)oxy]carbonyl}-5-oxo-D-norval inate

Benzyl (5S)-5-(2,3-difluorophenyl)-N,N-bis{[(2-methyl-2-propanyl) oxy]carbonyl}-6-nitro-D-norleucinate