| 摘要 |
<p>Penicillins of the formula <IMAGE> wherein X is O or S; Y is H or alkyl; Z is <IMAGE> R1 is H or OH; and R2 and R3 each are H or wherein X is O or S; Y is H or alkyl; R2 and R3 each are H or taken together with the carbons to which they are attached form an aromatic six-membered carbocyclic or N-heterocyclic ring and alkyl, alkoxy, dialkylamino or halogen derivatives thereof are active against Gram-positive and Gram-negative bacteria.</p> |
