title: Aldol condensations of regiospecific penicillanate and cephalosporanate enolates. Hydroxyethylation at C-6 and C-7.
mesh_terms: D002511:Cephalosporins / Q000138:chemical synthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D006900:Hydroxylation; D007536:Isomerism; D010406:Penicillins / Q000138:chemical synthesis*
chemical_list: D002511:Cephalosporins; D010406:Penicillins