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[摘要]:Seven new antibacterials, motualevic acids A-F (I-VI) and (4E)-(R)-antazirine (VII), have been isolated from the marine sponge Siliquariaspongia sp. and their structures elucidated by spectroscopic methods. Motualevic acids A-D are the first glycyl conjugates of the w-brominated lipid (E)-14,14-dibromotetradeca-2,13-dienoic acid, and motualevic acid F is the first long-chain 2H-azirine 2-carboxylic acid to be found in nature. Carboxylic acid-contg. compds. I and VI inhibit the growth of Staphylococcus aureus and methicillin-resistant S. aureus at 1.2-10.9 mg/mL. |
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