4-{((R)-2-Carboxy-3-methoxymethyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-en-7-ylcarbamoyl)-[(Z)-methoxyimino]-methyl}-thiazol-2-yl-ammonium
4-{((r)-2-carboxy-3-methoxymethyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-en-7-ylcarbamoyl)-[(z)-methoxyimino]-methyl}-thiazol-2-yl-ammonium