CAS No:63527-53-7(free base),65715-12-0(Sodium Salt)||Chemical Formula:C16H17N5O7S2||Molecular Weight:455.46000||Exact Mass:455.05694||(6R,7R)-3-[(acetyloxy)methyl]-7-[[(2E)-2-(2-aminothiazol-4-yl)-2-(methoxyimino)acetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid