allyl (4R,5S,6S)-3-(((3S,5S)-5-(2-acetamido-1-(methoxyimino)ethyl)-1-((allyloxy)carbonyl)pyrrolidin-3-yl)thio)-6-((R)-1-hydroxyethyl)-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate