(6R,7R)-7-((S)-3-carboxy-2-(4-hydroxyphenyl)propanamido)-7-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-5-oxa-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid
(6R,7R)-7-((S)-3-carboxy-2-(4-hydroxyphenyl)propanamido)-7-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-5-oxa-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid