A compound selected from: {[2-{[(4-bromophenyl)carbamoyl]amino}-3-(1H-indol-3-yl)propanoyl]amino}acetic acid; 2-{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}-2-methylpropanoic acid; {[2-{[(4-bromophenyl)carbamoyl]amino}-3-(1H-imidazol-4-yl)propanoyl]amino}acetic acid; {[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-(methylsulfonyl)butanoyl]amino}acetic acid; {[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-(methylsulfanyl)butanoyl]amino}acetic acid; 2-methyl-2-{[ -4-methyl-2-({[4-(trifluoromethyl)phenyl]carbamoyl}amino)pentanoyl]amino}propanoic acid; {[ -4-methyl-2-({[4-(methylsulfonyl)phenyl]carbamoyl}amino)pentanoyl]amino}acetic acid; {[ -4-methyl-2-({[4-(methylsulfinyl)phenyl]carbamoyl}amino)pentanoyl]amino}acetic acid; 2-{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}-2-methylpropanoic acid; ({ -4-methyl-2-[({4-[(trifluoromethyl)sulfanyl]phenyl}carbamoyl)amino]pentanoyl}amino)acetic acid; {[ -4-methyl-2-({[4-(methylsulfanyl)phenyl]carbamoyl}amino)pentanoyl]amino}acetic acid; {[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}acetic acid; {[(2R,3R)-2-{[(4-bromophenyl)carbamoyl]amino}-3-methylpentanoyl]amino}acetic acid; {[ -4-methyl-2-({[4-(trifluoromethyl)phenyl]carbamoyl}amino)pentanoyl]amino}acetic acid; {[ -2-{[(4-bromo-2-fluorophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}acetic acid; [(2-{[(4-bromophenyl)carbamoyl]amino}-2-methylpropanoyl)amino]acetic acid; [(2-{[(4-bromophenyl)carbamoyl]amino}-2-ethylbutanoyl)amino]acetic acid; [(2-{[(4-bromophenyl)carbamoyl]amino}-2,4-dimethylpentanoyl)amino]acetic acid; -{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}(phenyl)ethanoic acid; -2-{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}pentanoic acid; -2-{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}-3-methylbutanoic acid; -2-{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}propanoic acid; -2-{[ -2-{[(4-bromo-2-fluorophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}propanoic acid; {[ -2-{[(4-bromo-2-fluorophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}acetic acid; {[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}acetic acid; {[ -2-{[(4-bromo-2-fluorophenyl)carbamoyl]amino}pentanoyl]amino}acetic acid; {[ -2-{[(4-bromophenyl)carbamoyl]amino}pentanoyl]amino}acetic acid; {[(2S,3S)-2-{[(4-bromophenyl)carbamoyl]amino}-3-methylpentanoyl]amino}acetic acid; {[(2S,3S)-2-{[(4-bromo-2-fluorophenyl)carbamoyl]amino}-3-methylpentanoyl]amino}acetic acid; 3-{[ -2-{[(4-bromophenyl)carbamoyl]amino)-3-phenylpropanoyl]amino}propanoic acid; and {[ -2-{[(4-bromophenyl)carbamoyl]amino}-3-phenylpropanoyl]amino}acetic acid; or a pharmaceutically acceptable salt thereof. {[2-{[(4-bromophenyl)carbamoyl]amino}-3-(1H-indol-3-yl)propanoyl]amino}acetic acid; 2-{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}-2-methylpropanoic acid; {[2-{[(4-bromophenyl)carbamoyl]amino}-3-(1H-imidazol-4-yl)propanoyl]amino}acetic acid; {[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-(methylsulfonyl)butanoyl]amino}acetic acid; {[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-(methylsulfanyl)butanoyl]amino}acetic acid; 2-methyl-2-{[ -4-methyl-2-({[4-(trifluoromethyl)phenyl]carbamoyl}amino)pentanoyl]amino}propanoic acid; {[ -4-methyl-2-({[4-(methylsulfonyl)phenyl]carbamoyl}amino)pentanoyl]amino}acetic acid; {[ -4-methyl-2-({[4-(methylsulfinyl)phenyl]carbamoyl}amino)pentanoyl]amino}acetic acid; 2-{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}-2-methylpropanoic acid; ({ -4-methyl-2-[({4-[(trifluoromethyl)sulfanyl]phenyl}carbamoyl)amino]pentanoyl}amino)acetic acid; {[ -4-methyl-2-({[4-(methylsulfanyl)phenyl]carbamoyl}amino)pentanoyl]amino}acetic acid; {[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}acetic acid; {[(2R,3R)-2-{[(4-bromophenyl)carbamoyl]amino}-3-methylpentanoyl]amino}acetic acid; {[ -4-methyl-2-({[4-(trifluoromethyl)phenyl]carbamoyl}amino)pentanoyl]amino}acetic acid; {[ -2-{[(4-bromo-2-fluorophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}acetic acid; [(2-{[(4-bromophenyl)carbamoyl]amino}-2-methylpropanoyl)amino]acetic acid; [(2-{[(4-bromophenyl)carbamoyl]amino}-2-ethylbutanoyl)amino]acetic acid; [(2-{[(4-bromophenyl)carbamoyl]amino}-2,4-dimethylpentanoyl)amino]acetic acid; -{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}(phenyl)ethanoic acid; -2-{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}pentanoic acid; -2-{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}-3-methylbutanoic acid; -2-{[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}propanoic acid; -2-{[ -2-{[(4-bromo-2-fluorophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}propanoic acid; {[ -2-{[(4-bromo-2-fluorophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}acetic acid; {[ -2-{[(4-bromophenyl)carbamoyl]amino}-4-methylpentanoyl]amino}acetic acid; {[ -2-{[(4-bromo-2-fluorophenyl)carbamoyl]amino}pentanoyl]amino}acetic acid; {[ -2-{[(4-bromophenyl)carbamoyl]amino}pentanoyl]amino}acetic acid; {[(2S,3S)-2-{[(4-bromophenyl)carbamoyl]amino}-3-methylpentanoyl]amino}acetic acid; {[(2S,3S)-2-{[(4-bromo-2-fluorophenyl)carbamoyl]amino}-3-methylpentanoyl]amino}acetic acid; 3-{[ -2-{[(4-bromophenyl)carbamoyl]amino)-3-phenylpropanoyl]amino}propanoic acid; and {[ -2-{[(4-bromophenyl)carbamoyl]amino}-3-phenylpropanoyl]amino}acetic acid;