NEW INSECTICIDAL CYCLODEPSIPEPTIDES FROM THE FUNGUS ISARIA FELINA

II. STRUCTURE ELUCIDATION OF ISARIINS B, C AND D

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Isariins B, C and D, isolated from a strain of Isaria felina, were shown to be cyclodepsipeptides constituted by a pentapeptide cyclized through a β-hydroxyacid. The nature of the latter and the sequence of the peptide were determined for each compound. Relations between insecticidal activity and structure of the depsipeptides were pointed out.