| 摘要 |
<p>New B-Lactam antibiotics, their production, and their medicinal use B-Lactam compounds of the formula in which B denotes an optionally substituted heterocyclic 5-membered or 6-membered ring or an optionally substituted phenyl ring, Z denotes a hydrogen atom or a C1 to C4 alkoxy group, , , or Y, E1 and E2 independently of one another denote a divalent organic radical and R1, R2, R3 and R4 independently of one another denote a hydrogen atom or an alkyl, alkenyl, alkinyl, alkadienyl, cycloalkyl, cycloalkenyl, cycloalkadienyl, aryl or heterocyclyl radical, it also being possible for the above-mentioned radicals, with the exception of hydrogen, to be substituted, or an acyl radical, are antibacterial agents with a broad antibacterial spectrum and are useful as agents for promoting growth and for improving feed utilisation in animals and as antioxidants.</p> |
