| 摘要 |
Compounds of the formula wherein R1 denotes optionally substituted phenyl, thienyl, furyl or 1,4-cyclohexadienyl, R2 represents a free carboxyl group or an esterified carboxyl group which can be split physiologically, R3 represents hydrogen, lower alkoxy or an optionally substituted methyl group and B represents an optionally substituted six-membered ring with 1 to 3 ring nitrogen atoms, which is bonded to the carbonyl group -C(=O)-by one of its carbon atoms, the nitrogen atoms of a monocyclic six-membered ring having 2 nitrogen atoms being either adjacent or separated by two ring carbon atoms, and the salts of such compounds which have a salt-forming group, including the inner salts, for example the 7.beta.-¢D(-)-.alpha.-(3,5-Dioxo-2,3,4, 5-tetrahydro-1,2,4-triazine-6-carboxamido)-phenylacetamido)-cephalosporanic acid, have antibiotic activity. |
