| 摘要 |
Novel six-membered hetero "N" compounds having antibiotic activity, represented by the formula: <IMAGE> where X=S, O, CH2, or Se Y=OH, NH2, NHCOR9, or SH R1,R2,R3,R4,R5,R6,R7 (which may be identical or different)=H, alkyl, or aryl R9=a beta -lactam active side chain; computer models for evaluating such compounds and processes for preparing them.
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