CAS No.: 111900-24-4 Synonyms: (6 R ,7 R )-7-(( R )-2-Amino-2-( p -hydroxyphenyl)acetamido)-8-oxo-3-(1 E )-propenyl-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid monohydrate; trans -Cefprozil Formula: C₁₈H₁₉N₃O₅S ¬? H₂O …