(6R,7R)-3-((acetylthio)methyl)-7-(5-amino-5-carboxypentanamido)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

4-ethyl-N-((2R,3S)-3-hydroxy-1-(((5aR,6S)-6-methoxy-1,7-dioxo-1,3,4,5a,6,7-hexahydroazeto[2,1-b]furo[3,4-d][1,3]thiazin-6-yl)amino)-1-oxobutan-2-yl)-2,3-dioxopiperazine-1-carboxamide