CAS No:92143-31-2(free base);97164-54-0( Disodium Salt)||Chemical Formula:C18H18N8O7S3 ||Molecular Weight:554.57100||Exact Mass:554.04606||(6R,7R)-7-[[(2E)-(2-aminothiazol-4-yl)(methoxyimino)acetyl]amino]-3-[[(2-methyl-5,6-dioxo-1,2,5,6-tetrahydro-1,2,4-triazin-3-yl)sulfanyl]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid