Synonyms: 5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid, 7-amino-3-(chloromethyl)-8-oxo-, (4-methoxyphenyl)methyl ester,monohydrochloride, (6R,7R)- (9CI);5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 7-amino-3-(chloromethyl)-8-oxo-,(4-methoxyphenyl)methyl ester, monohydrochloride, (6R-trans)-;