1000980-59-5

(6R,7R)-7-[[(2R)-2-Amino-2-(4-hydroxyphenyl)acetyl]amino]-8-oxo-3-(1Z)-1-propen-1-yl-5-thia-1-azabicyclo[4.2.0]oct-3-ene-2-carboxylic Acid is an impurity of Cefprozil (C243910), a semisynthetic oral cephalosporin consisting of approx. 90:10 Z/E isomeric mixture. Cefprozil is an antibacterial.