(6R,7S)-7-amino-8-oxo-1-azabicyclo<4.2.0>oct-2-en-2-carboxylic acid
2-(2-aminothiazol-4-yl)-2-(methoxy)iminoacetic acid
(6R*,7S*)-7-amino-8-oxo-1-azabicyclo<4.2.0>oct-2-en-2-carboxylic acid
(6R,7S)-8-Oxo-7-phenylacetylamino-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid