(-)-5-Amino-2-(((6R,7R)-7-(2-(2-amino-4-thiazolyl)glyoxylamido)-2-carboxy-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-en-3-yl)methyl)-1-(2-hydroxyethyl)pyrazolium hydroxide, inner salt, 7(sup 2)-(Z)-(O-methyloxime)