EINECS 258-580-8, (6R,7R)-4-Nitrobenzyl 7-amino-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate hydrochloride, p-Nitrobenzyl 7-amino-3-chloro-3-cephem-4-carboxylate hydrochloride, p-Nitrobenzyl (6R-trans)-7-amino-3-chloro-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylate monohydrochloride, p-Nitrobenzyl (6R-trans)-7-amino-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate monohydrochloride