| 摘要 |
<p>(A) Cmpds. of general formula (I):- R = phenyl, substd. phenyl or thienyl R' = alkyl, alkenyl, aryl, aralkyl, O-alkyl, O-aryl, O-aralkyl, S-alkyl, S-aryl, S-aralkyl or an opt. subst. heterocyclic gp. X = O or S; Y = CO or SO2 (B) Non-toxic salts of (I). Antibiotics esp. for veterinary use.</p> |
