Pyridinium, 4-(((7-(((2-amino-4-thiazolyl)((1-carboxy-1-methylethoxy)imino)acetyl)amino)-2-carboxy-4-methyl-8-oxo-5-oxa-1-azabicyclo(4.2.0)oct-2-en-3-yl)methyl)thio)-1-methyl-, hydroxide, inner salt, (4S-(4alpha,6beta,7alpha(Z)))-