title: Chemistry of the dihydrothiazine ring moiety of cephalosporins. 1. Regiospecificity and stereoselectivity in the bromine addition to 2-cephem derivatives. A new route to 2-methoxy cephalosporins.
mesh_terms: D001966:Bromine; D002511:Cephalosporins / Q000138:chemical synthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D012997:Solvents; D013237:Stereoisomerism; D013843:Thiazines
chemical_list: D002511:Cephalosporins; D012997:Solvents; D013843:Thiazines; D001966:Bromine