(4R,5S,6S)-3-[[(3S,5S)-5-[[(3S)-3-[[2-[(AMinoiMinoMethyl)aMino]acetyl]aMino]-1-pyrrolidinyl]carbonyl]-1-Methyl-3-pyrrolidinyl]thio]-6-[(1R)-1-hydroxyethyl]-4-Methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic Acid