3-(4-aminophenyl)-5-{[(2-oxopyrrolidin-1-yl)carbonyl]amino}isothiazol-4-carboxamide

3-[4-({[(4-methylphenyl)amino]carbonyl}amino)phenyl]-5-{[(2-oxopyrrolidin-1-yl)carbonyl]amino}isothiazol-4-carboxamide

4-{[({4-(aminocarbonyl)-3-[4-({[(4-methylphenyl)amino]carbonyl}amino)phenyl]isothiazol-5-yl}amino)carbonyl]amino}butanoic acid

methyl 4-{[({4-(aminocarbonyl)-3-[4-({[(4-methylphenyl)amino]carbonyl}amino)phenyl]isothiazol-5-yl}amino)carbonyl]amino}butanoate

4-[({[4-(aminocarbonyl)-3-(4-nitrophenyl)isothiazol-5-yl]amino}carbonyl)amino]butanoic acid