1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid,3-[[(3S,5S)-1-carboxy-5-[[3-carboxy-4-(hydroxyimino)-1-pyrrolidinyl]carbonyl]-3-pyrrolidinyl]thio]-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-,2-(2-propenyl) ester, (4R,5S,6S)-