Pyrazine, 2-(2-furanyl)-5-methoxy-

1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4,4-difluorobutanoyl]-3-hydroxyazetidine-3-carboxylic acid

1-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-1,3-thiazole-4-carbonyl]-3-hydroxyazetidine-3-carboxylic acid

1-[4-ethyl-6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanoyl]-3-hydroxyazetidine-3-carboxylic acid

1-{2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-4,4-dimethylpentanoyl}-3-hydroxyazetidine-3-carboxylic acid

1-{3-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-5-methylhexanoyl}-3-hydroxyazetidine-3-carboxylic acid

1-[(2S)-3-(tert-butoxy)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-3-hydroxyazetidine-3-carboxylic acid

1-{2-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)ethyl]-1,3-thiazole-4-carbonyl}-3-hydroxyazetidine-3-carboxylic acid

(2S)-2-({5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1,2-oxazol-3-yl}formamido)-3-hydroxypropanoic acid

3-({5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1,2-oxazol-3-yl}formamido)-2-hydroxypropanoic acid

1-{5-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1,2-oxazole-3-carbonyl}-3-methylazetidine-3-carboxylic acid