title: Studies on semi-synthetic 7 alpha-formamidocephalosporins. II. Synthesis and antibacterial activity of some 7 alpha-formamidoceph-3-em-1-oxide and 7 alpha-formamido-1-oxadethiaceph-3-em derivatives.
mesh_terms: D001419:Bacteria / Q000187:drug effects; D002511:Cephalosporins / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship
chemical_list: D002511:Cephalosporins