| 摘要 |
A-21978C cyclic peptide derivatives of the formula <IMAGE> 1 wherein R is a substituted benzoyl group of the formula <IMAGE> R2 is C8-C15 alkyl; X is hydrogen, chloro, bromo, iodo, nitro, C1-C3 alkyl, hydroxy, C1-C3 alkoxy, or C1-C3 alkylthio; and R1 is hydrogen or an amino-protecting group; and the salts thereof, are useful new semisynthetic antibacterial agents or intermediates to such agents.
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