(6R-trans)-3-Methyl-8-oxo-7-(phenylacetamido)-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid 27255-72-7 34708-38-8 5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-methyl-8-oxo-7-((phenylacetyl)amino)-, (6R-trans)- EINECS 248-379-3 Phenylacetyl 7-aminodesacetoxycephalosporanic acid