2-acetamido-3-(4-acetyloxyphenyl)prop-2-enoic acid

(S,Z)-2-((tert-butoxycarbonyl)amino)-3-(4-(4-hydroxybenzylidene)-2-methyl-5-oxo-4,5-dihydro-1H-imidazol-1-yl)propanoic acid

4-(4-(4-hydroxybenzylidene)-2-methyl-5-oxo-4,5-dihydro-1H-imidazol-1-yl)butanoic acid

(Z)-tert-butyldiphenylsilyl 4-(4-(4-((tert-butyldiphenylsilyl)-oxy)benzylidene)-2-methyl-5-oxo-4,5-dihydro-1H-imidazol-1-yl)butanoate

(Z)-ethyl 4-(4-(2-(difluoroboryl)-4-hydroxybenzylidene)-2-methyl-5-oxo-4,5-dihydro-1H-imidazol-1-yl)butanoate