Synonyms: 5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid, 7-amino-3-methyl-8-oxo-, (4-nitrophenyl)methyl ester, (6R-trans)-;5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 7-amino-3-methyl-8-oxo-,p-nitrobenzyl ester (8CI); Benzyl alcohol, p-nitro-,7-amino-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate(ester) (8CI)