(6R,7S)-7-((2R,3S)-2-(4-ethyl-2,3-dioxopiperazine-1-carboxamido)-3-hydroxybutanamido)-7-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid; 7-[[2-[[(4-Ethyl-2,3-dioxo-1-piperazinyl)carbonyl]amino]-3-hydroxy-1-oxobutyl]amino]-7-methoxy-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-, [6R-[6?,7?,7(2R*,3S*)]]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid
