5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-((((aminocarbonyl)amino)-2-thienylacetyl)amino)-7-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-, monosodium salt, (6R-(6alpha,7alpha))- 67780-08-9 SQ 13,426 SQ 13426