5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-((acetyloxy)methyl)-7-methoxy-8-oxo-7-((2-thienylacetyl)amino)-, cis- 52128-53-7 EINECS 257-678-8 cis-(1)-3-(Acetoxymethyl)-7-methoxy-8-oxo-7-(2-thienylacetamido)-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid