6,6-Dimethoxy-3-azabicyclo[3.1.1]heptane

rac-4-[(1R,5S)-5-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclohex-3-ene-1-carbonyl]thiomorpholine-2-carboxylic acid

1-[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylbut-2-enoyl]-2-methylpyrrolidine-3-carboxylic acid

2-[3-(dimethylamino)-N-ethyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanamido]-2-methylpropanoic acid

4-{2-[2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopentyl]acetamido}oxolane-3-carboxylic acid

rac-(1R,2S)-2-{2-[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclopropyl]acetamido}cyclopentane-1-carboxylic acid

4-(3-cyanopiperidin-1-yl)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-4-oxobutanoic acid

(2S)-2-{[(1RS,3RS,5RS)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[3.1.0]hexan-1-yl]formamido}-3-methylpentanoic acid

rac-2-{[(1R,3R,5R)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)bicyclo[3.1.0]hexan-1-yl]formamido}pent-4-enoic acid

4-({1-[(tert-butoxy)carbonyl]-3-cyanopiperidin-4-yl}({[(9H-fluoren-9-yl)methoxy]carbonyl})amino)butanoic acid

2-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-N-methylpentanamido]benzoic acid