4-(2-(((6R,7R)-2-carboxy-7-((Z)-2-(ethoxyimino)-2-(5-(phosphonoamino)-1,2,4-thiadiazol-3-yl)acetamido)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl)thio)thiazol-4-yl)-1-methylpyridin-1-ium acetate
4-(2-(((6R,7R)-2-carboxy-7-((Z)-2-(ethoxyimino)-2-(5-(phosphonoamino)-1,2,4-thiadiazol-3-yl)acetamido)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl)thio)thiazol-4-yl)-1-methylpyridin-1-ium acetate