title: Synthesis of benzyl 6-oxopenicillanate and derivatives. I.
mesh_terms: D001593:Benzyl Compounds / Q000138:chemical synthesis; D007659:Ketones; D008722:Methods; D010406:Penicillins / Q000138:chemical synthesis*
chemical_list: D001593:Benzyl Compounds; D007659:Ketones; D010406:Penicillins