(6R,7R)-3-(acetoxymethyl)-7-((2S)-2-(5-(acetoxymethyl)-4-carboxy-3,6-dihydro-2H-1,3-thiazin-2-yl)-2-aminoacetamido)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(6R,7R)-3-(acetoxymethyl)-7-((2S)-2-(5-(acetoxymethyl)-4-carboxy-3,6-dihydro-2H-1,3-thiazin-2-yl)-2-aminoacetamido)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid