摘要 |
The invention provides compounds of formula Wherein R<SUP>1</SUP>, R<SUP>2</SUP>, R<SUP>3</SUP>, R<SUP>4</SUP>, R<SUP>5</SUP>, R<SUP>6a</SUP>, R<SUP>6b</SUP>, R<SUP>6c</SUP>, R<SUP>6d</SUP>, R<SUP>6e </SUP>and R<SUP>7 </SUP>are defined in the specification. These compounds are useful as antibiotic agents.
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