"(6R,7S)-3-[[(5-Methyl-1,3,4-thiadiazol-2-yl)thio]methyl]-8-oxo-7-[(1H-tetrazol-1-ylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid-13C2,15N Sodium Salt;","7-epi-Cefazolin-13C2,15N Sodium Salt","Labelled 7-epi-Cefazolin (C242510). 7-epi-Cefazolin is the 7-epimer of Cefazolin (C242500), a semi-synthetic antibiotic derived from 7-amino-cephalosporanic acid, as an antibacterial. Cefazolin impurity X1.", Stable Isotopes
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