1-Azabicyclo3.2.0hept-2-ene-2-carboxylic acid, 3-(3S,5S)-5-(aminosulfonyl)aminomethyl-3-pyrrolidinylthio-6-(1R)-1-hydroxyethyl-4-methyl-7-oxo-, hydrate (1:1), (4R,5S,6S)-