title: Studies of lactams. Part 47. Penicillin and cephalosporin analogues with methylthio-substituents.
mesh_terms: D002511:Cephalosporins / Q000138:chemical synthesis*; D007769:Lactams / Q000138:chemical synthesis; D008745:Methylation; D010406:Penicillins / Q000138:chemical synthesis*; D013237:Stereoisomerism
chemical_list: D002511:Cephalosporins; D007769:Lactams; D010406:Penicillins