5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid,7-(((2R)-((((2-((4-(aminosulfonyl)phenyl)amino)-1,4-dihydro-4-oxo-5-pyrimidinyl)amino)carbonyl)amino)(4-hydroxyphenyl)acetyl)amino)-7-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-, monosodium salt, (6R,7S)- 77993-85-2