Ceftiofur Sodium 

6R,7R-7-[[2-amino-4-thiazolyl-Z-methoxyiminoacetyl]amino]-3-[[2-furanylcarbonylthio]methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, monosodium salt.

Molecular Formular: C19H16N5 NaO7S3

Molecular Weight: 545.55

CA Registry Number: 104010-37-9

ceftiofur sodium