(1R,5S,6S)-2-((3S,5S)-5-(4-(3-carboxy-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-quinolinyl)-1-piperazinyl)-carbonylpyrrolidin-3-ylthio)-6-((R)-1-hydroxyethyl)-1-methacarbapen-2-em-3-carboxylic acid disodium salt