196394-47-5 1-(tert-Butyl) 2-methyl (S)-4-((dimethylamino)methylene)-5-oxopyrrolidine-1,2-dicarboxylate
125119-72-4 <br>ethyl 4-[2-amino-4-(5-methyl-2-oxo-2,3-dihydro-1H-imidazol-4-yl)-1,3-thiazo l-5-yl]butanoate