1-Azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-((2-(acetylamino)ethenyl)thio)-6-(1-methylethyl)-7-oxo-
1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-((2-(acetylamino)ethenyl)thio)-6-(1-methylethyl)-7-oxo-