3-(4-fluorobenzyl)-8-(3-methoxyphenyl)-1,6,7-trimethyl-1H-imidazo[2,1-f]purine-2,4(3H,8H)-dione

5-({[1-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)cyclobutyl]formamido}methyl)-1-methyl-1H-pyrazole-4-carboxylic acid

5-({2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]butanamido}methyl)-1-methyl-1H-pyrazole-4-carboxylic acid

5-{[4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylbutanamido]methyl}-1-methyl-1H-pyrazole-4-carboxylic acid

5-{[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2,2-dimethylpropanamido]methyl}-1-methyl-1H-pyrazole-4-carboxylic acid

(2R)-1-[2-cyclopropyl-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)acetyl]-2-methylpyrrolidine-2-carboxylic acid

(2R)-1-[2-(cyclopropylmethyl)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)propanoyl]-2-methylpyrrolidine-2-carboxylic acid

(2R)-1-[3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(propan-2-yl)butanoyl]-2-methylpyrrolidine-2-carboxylic acid

(2S)-3-(dimethylamino)-2-({2-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-1,3-thiazol-4-yl}formamido)propanoic acid

(2S)-3-(dimethylamino)-2-{[(2RS,3SR)-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)oxolan-2-yl]formamido}propanoic acid

4-(dimethylamino)-2-[6-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)hexanamido]butanoic acid